According to the expert, the exploration of the Mars by robots ______.
A. is not feasible in centuries
B. may be difficult to fulfill
C. might be fulfilled someday in future
D. will take decades of years
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Which of the following apparatus of the body may be less affected by removing gravity？
A. The inner ear.
B. The limbs.
C. The nerves.
D. The brain.
The function of apparatus of the inner ear is ______.
A. to partition into two distinct components
B. to respond to linear movement
C. to send a signal to the brain to tell us the direction of gravity
D. to respond to the weight of limb segments and other body parts
The aerial photographs taken last year indicate that ______.
A. there did exist liquid water on Mars
B. a drainage channel was cut deeply by Martians
C. there isn't any life on Mars
D. water had flew on Mars for hundreds to thousands of years
A．inB．betweenC．amongD．in between
A. in
B. between
C. among
D. in between
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