第1题:
A 、one-thind
B、one-fourth
C、one-fth
D、two-thinds
第2题:

第3题:
第4题:
第5题:
第6题:
第7题:
第8题:
The most important features in the growth of American economy in the early 20th cenruty were()
第9题:
第10题:
latitude scale near the middle of the track line
longitude scale near the middle of the track line
latitude scale at the midlatitude of the chart
latitude or longitude scale at the middle of the scale
第11题:
the use of steam and electricity as chief energy,the development of lare corporation and the development of railway
the development of large corporation,urbanization and the employment in production of new technology
the appearance of airplane,the use of electricity on a large scale and urbanization
the rapid development of industry,railway and large cities
第12题:
Getting off to work with a minimum effort helps save one's energy.
Dr. Kleitman doesn't explain why people reach their peaks at different hours of the day.
Habit helps one adapt to his own energy cycle.
Children have energy cycles, too.
第13题:
A.scale-out
B.scale-deep
C.scale-up
D.scale-wide
第14题:
第15题:
第16题:
第17题:
第18题:
第19题:
The most important features in the growth of American economy in the early 20th cenruty were()
Athe use of steam and electricity as chief energy,the development of lare corporation and the development of railway
Bthe development of large corporation,urbanization and the employment in production of new technology
Cthe appearance of airplane,the use of electricity on a large scale and urbanization
Dthe rapid development of industry,railway and large cities
第20题:
第21题:
mechanical energy to kinetic energy to potential energy
mechanical energy to potential energy to kinetic energy
potential energy to mechanical energy to kinetic energy
kinetic energy to mechanical energy to potential energy
第22题:
第23题:
assemble
gather
generate
yield
第24题:
Man's energy cycle can be changed easily.
Some family quarrels are caused by unawareness of energy cycle.
Getting up early in the morning is not easy.
Everyone has a daily energy cycle but a lazy one.