单选题After the heavy snow storm many people _____ on the icy streets and injured their arms and legs.A slippedB skippedC skiedD tripped

Many people believe the glare from snow causes snow-blindness． Yet, dark glasses or not,they find themselves suffering from headaches and watering eyes, and even snow-blindness, when exposed to several hours of "snow light"．
The United States Army has now determined that glare from snow does not cause snow-
blindness in troops in a snow-covered country． Rather, a man's eyes frequently find nothing to focus on in a broad expanse of barren snow-covered terrain． So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at． Finding nothing,hour after hour, the eyes never stop searching and the eyeballs become sore and the eye musclesache． Nature offsets this irritation by producing more and fluid which covers the eyeball． The fluid covers the eyeball in increasing quantity until vision blurs, then is observed, and the result is
total, even though temporary, snow-blindness．
Experiments led the Army to a simple method of overcoming this problem． Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape． Even the scouts themselves throw lightweight, dark colored objects ahead on which they too can focus． The men following can then see something．Their gaze is arrested． Their eyes focus on a bush and having found something to see, stop scouring the snow-blanketed landscape． By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow-blind or lost． In this way the problem of crossing a solid white terrain is overcome．
Snow-blindness may be avoided by__________

A.concentrating to the solid white terrain
B.searching for something to look at in snow-covered terrain
C.providing the eyes with something to focus on
D.covering the eyeballs with fluid

Many people believe the glare from snow causes snow-blindness． Yet, dark glasses or not,they find themselves suffering from headaches and watering eyes, and even snow-blindness, when exposed to several hours of "snow light"．
The United States Army has now determined that glare from snow does not cause snow-
blindness in troops in a snow-covered country． Rather, a man's eyes frequently find nothing to focus on in a broad expanse of barren snow-covered terrain． So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at． Finding nothing,hour after hour, the eyes never stop searching and the eyeballs become sore and the eye musclesache． Nature offsets this irritation by producing more and fluid which covers the eyeball． The fluid covers the eyeball in increasing quantity until vision blurs, then is observed, and the result is
total, even though temporary, snow-blindness．
Experiments led the Army to a simple method of overcoming this problem． Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape． Even the scouts themselves throw lightweight, dark colored objects ahead on which they too can focus． The men following can then see something．Their gaze is arrested． Their eyes focus on a bush and having found something to see, stop scouring the snow-blanketed landscape． By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow-blind or lost． In this way the problem of crossing a solid white terrain is overcome．
A suitable title for this passage would be __________ ．

A.Snow-Blindness and How to Overcome It
B.Nature's Cure for Snow Blindness
C.Soldiers in the Snow
D.Snow Vision

共用题干
Mother Nature Shows Her Strength

Tornadoes（龙卷风）and heavy thunderstorms moved across the Great Lakes and into
Trumbull County on Saturday evening.The storms were dramatic and dangerous.
Georae Snyder was driving the fire truck down Route 88 when he first noticed that a
funnel（漏斗状的）cloud was behind him. "I stopped the truck and watched the tunnel
cloud.It was about 100 feet off the ground and I saw it go up and down for a while.It was
movina toward Bradley Road and then suddenly it disappeared,"Snyder said.
Snyder only saw one of the funnel clouds that passed through northeastern Ohio on
Saturday.In Trumbull County,a tornado turned trees onto their sides.Some trees fell onto
houses and cars.Other trees fell into telephone and electrical wires as they went down.
Amanda Symcheck was having a party when the storm began."I knew something was
wrong."she said."I saw the sky go green and pink（粉红色）.Then it sounded like a train
rushing toward the house.I started crying and told everyone to go to the basement for
protection."
The tornado caused a lot of damage to cars and houses in the area.It will take a long
time and much money to repair everything.There was also serious water damage from the
thunderstorms.The heavy rains and high wind caused the power to go out in many homes.
The storms caused serious flooding in areas near the river. More than four inches of
rain fell in parts of Trumbull County.The river was so high that the water ran into streets
and houses.Many streets had to be closed to cars and trucks because of the high water.
This made it difficult for fire trucks,police cars and other rescue vehicles to help people who
were in trouble.
Many people who live near the river had to leave their homes for their own safety.
Some people reported five feet of water in their homes.Local and state officials opened
emergency shelters for the people who were evacuated（撤走）.The Red Cross served
meals to them.
"This was a really intense storm,"said Snyder."People were afraid.Mother Nature
can be fierce.We were lucky this time.No one was killed."

Several people were missing during the storm.
A: Right
B: Wrong
C: Not mentioned

The heavy snow could not keep us going out to work．

A.from
B.on
C.upon
D.up

Many people believe the glare from snow causes snow-blindness． Yet, dark glasses or not,they find themselves suffering from headaches and watering eyes, and even snow-blindness, when exposed to several hours of "snow light"．
The United States Army has now determined that glare from snow does not cause snow-
blindness in troops in a snow-covered country． Rather, a man's eyes frequently find nothing to focus on in a broad expanse of barren snow-covered terrain． So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at． Finding nothing,hour after hour, the eyes never stop searching and the eyeballs become sore and the eye musclesache． Nature offsets this irritation by producing more and fluid which covers the eyeball． The fluid covers the eyeball in increasing quantity until vision blurs, then is observed, and the result is
total, even though temporary, snow-blindness．
Experiments led the Army to a simple method of overcoming this problem． Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape． Even the scouts themselves throw lightweight, dark colored objects ahead on which they too can focus． The men following can then see something．Their gaze is arrested． Their eyes focus on a bush and having found something to see, stop scouring the snow-blanketed landscape． By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow-blind or lost． In this way the problem of crossing a solid white terrain is overcome．
?The scouts shake snow from evergreen bushes in order to__________ ．

A.give the men behind something to see
B.beautify the landscape
C.warm themselves in the cold
D.prevent the men behind from losing their way

Many people believe the glare from snow causes snow-blindness． Yet, dark glasses or not,they find themselves suffering from headaches and watering eyes, and even snow-blindness, when exposed to several hours of "snow light"．
The United States Army has now determined that glare from snow does not cause snow-
blindness in troops in a snow-covered country． Rather, a man's eyes frequently find nothing to focus on in a broad expanse of barren snow-covered terrain． So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at． Finding nothing,hour after hour, the eyes never stop searching and the eyeballs become sore and the eye musclesache． Nature offsets this irritation by producing more and fluid which covers the eyeball． The fluid covers the eyeball in increasing quantity until vision blurs, then is observed, and the result is
total, even though temporary, snow-blindness．
Experiments led the Army to a simple method of overcoming this problem． Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape． Even the scouts themselves throw lightweight, dark colored objects ahead on which they too can focus． The men following can then see something．Their gaze is arrested． Their eyes focus on a bush and having found something to see, stop scouring the snow-blanketed landscape． By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow-blind or lost． In this way the problem of crossing a solid white terrain is overcome．
To prevent headaches, watering eyes and blindness caused by the glare from snow, dark glasses are__________ ．

A.indispensible
B.useful
C.ineffective
D.available

共用题干
Mother Nature Shows Her Strength

Tornadoes（龙卷风）and heavy thunderstorms moved across the Great Lakes and into
Trumbull County on Saturday evening.The storms were dramatic and dangerous.
Georae Snyder was driving the fire truck down Route 88 when he first noticed that a
funnel（漏斗状的）cloud was behind him. "I stopped the truck and watched the tunnel
cloud.It was about 100 feet off the ground and I saw it go up and down for a while.It was
movina toward Bradley Road and then suddenly it disappeared,"Snyder said.
Snyder only saw one of the funnel clouds that passed through northeastern Ohio on
Saturday.In Trumbull County,a tornado turned trees onto their sides.Some trees fell onto
houses and cars.Other trees fell into telephone and electrical wires as they went down.
Amanda Symcheck was having a party when the storm began."I knew something was
wrong."she said."I saw the sky go green and pink（粉红色）.Then it sounded like a train
rushing toward the house.I started crying and told everyone to go to the basement for
protection."
The tornado caused a lot of damage to cars and houses in the area.It will take a long
time and much money to repair everything.There was also serious water damage from the
thunderstorms.The heavy rains and high wind caused the power to go out in many homes.
The storms caused serious flooding in areas near the river. More than four inches of
rain fell in parts of Trumbull County.The river was so high that the water ran into streets
and houses.Many streets had to be closed to cars and trucks because of the high water.
This made it difficult for fire trucks,police cars and other rescue vehicles to help people who
were in trouble.
Many people who live near the river had to leave their homes for their own safety.
Some people reported five feet of water in their homes.Local and state officials opened
emergency shelters for the people who were evacuated（撤走）.The Red Cross served
meals to them.
"This was a really intense storm,"said Snyder."People were afraid.Mother Nature
can be fierce.We were lucky this time.No one was killed."

Power supply system was not damaged during the storm.
A:Right
B:Wrong
C:Not mentioned

After the storm, the lake returned to its usual ___ state.

A.flaccid
B.placid
C.lucid
D.acid