Mr. Engelberger deems that what hinders the development of domestic robots is the lack of
A. money
B. time
C. technology
D. energy
查看答案
Annie had arranged to go out after work.
A. True
B. False
Which of the following statements is NOT true？
A. Doctors know more about chronotherapeutics than before.
B. Doctors in the U. S. used to be thirsty to know more about the new medical field.
C. The researchers' insights are providing new strategies to prevent common killers.
D. The strategic use of time in medicine attracts more attention in the medical circle in the U.S.
Which of the following is NOT true of the mirrors？
A. They would be made of plastic and coated with aluminium.
B. They could reflect sunlight to a large area on the earth.
C. They would stay in the same position over the earth.
D. They could be launched directly into space.
The reflected light would sweep slowly along the surface of the earth because the mirrors
A. would be operated by solar-powered engines
B. could be made to adjust their angles
C. could move around the earth at the same speed as the earth turns on its axis
D. would orbit thousands of miles high to catch the sun's light
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