D. factory workers
(
)50. Some disabled people need robots to
.
A. make robots
B. become scientists
C. look after themselves
D. do dangerous jobs
(
)51. Meldog is a
.
A. blind dog
B. robot scientist
C. real dog
D. robot guide dog
(
)52. The robots used in American hospitals can do the following except
.
A. make a map
B. shave patients
C. brush the patients’ teeth
D.take meals from the kitchen to the patients’ rooms
C
A strange thing happens to nearly everybody at night. They turn off the lights, put up the covers and close their eyes. Six or seven hours later, they wake up again. Strange, isn’t it?
Sleep puzzles science. Scientists and doctors would rather talk about why one can’t fall asleep. They are not so sure what causes sleep.
stomachache.
Don’t worry if you dream. Some great stories and poems were begun while the writers slept.
(
)53. Sleep puzzles scientists because they are not certain _______.
A. why one can’t fall asleep
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