B
Scientists are trying to make the deserts into good land again. They want to,bring water to the deserts. But more and more places of the earth is becoming deserts all the time, Scientists may not be able to change the deserts. Scientists think that people make deserts. People are do-ing bad things to the earth.
Some places on the earth don-t get very much rain. But they still don-t become deserts.This is because some green plants are growing there. Small green plants and grass are very helpful to dry places. Plants don't let the wind blow the earth away. When 8 little bit of rain falls,the plants hold the water. Without plants,the land can become a desert much more easily.
( )26. Why can the land become a desert?
A. Because some places don't get very much rain.
B. Because plants don-t let the hot sun make the earth even drier.
C. Because people don't keep the earth well.
D. Because scientists haven-t learnt enough about the deserts.
第1题:
A.which
B.that
C.where
D.when
第2题:
此题为判断题(对,错)。
第3题:
27. Scientists ____to make the deserts into good land again.
A. carry water'
B.grow food
C. do nothing
D. study a lot
第4题:
27. Why does eating apples make one-s stomach want less food?
A. Because apples are delicious.
B. Because apples are full of fiber and water.
C. Because apples are sour.
D. Because only apples are filled with calories.
第5题:
Good anchorage may be obtained anywhere in this water area, the bottom being generally mud and sand, vessel may have ______.
A.good getting ground
B.good holding ground
C.good grabbing ground
D.good handling ground
第6题:
第7题:
第8题:
第9题:
第10题:
Water transport occurs on inland waterways,such as(),and oceans.
第11题:
A land breeze
A sea breeze
A norther
A prevailing westerly
第12题:
第13题:
A、deserves
B、requests
C、deserts
第14题:
A
Why do plants grow in some places and not in others? Why does some land have so much growing on it,while other land has almost no plants growing on it at all?
To grow plants need several things. One is warmth. In very cold places almost nothing grows. Plants also need water. In very dry parts of the earth only a few unusual plants can grow. That's why dry deserts everywhere are almost not covered by trees or grass.
Plants must also have a place in which to f,ut down their roots and grow. They find it diffi-culr to grow on hard land. The town is built on hard land. The plants here have only the soil found between the cracks of the stones Io grow in.
Another thing plants must have before they can grow is food.
Whar will happen if we try to make things grow on the sandy beach? A few plants,such as beach grass,will grow in sand,L ut most plants won-t. Even if the weather is warm enough.and we water the plants each day. Many of them will die because the sand on this beach has al-most no food for plants.
( )21. According to the passage,plants need _________ things to grow well.
A. two
B. three
C. four
D. five
第15题:
28. Which is NOT true?
A. The land never stops becoming deserts.
B. Scientists ask the people to live in the deserts and grow food there.
C. People do bad things to the earth.
D. Scientists may not be able to change the deserts.
第16题:
It makes good______to bring all umbrella;it seems to be raining today.
A.sense
B.reason
C.suggestion
D.advice
第17题:
Good anchorage may be obtained anywhere,generally mud and sand,in this water area Vessel may have______.
A.good dragging ground
B.good towing ground
C.good holding ground
D.good grabbing ground
第18题:
第19题:
第20题:
第21题:
Rubbish can be thrown into the water ().
第22题:
Horizontal movement of the water toward the land after high tide
Horizontal movement of the water toward the land after low tide
Horizontal movement of the water away from the land following high tide
Horizontal movement of the water away from the land following low tide
第23题:
Tornado
Waterspout
Hurricane
Cyclone