单项选择题

The passage is mainly concerned with ______.

A．the feasibility of life existing on other planets
B．the description of Mars's physical environment
C．the comparison between the physical features of Mars and the Earth
D．the feasibility of men's migrating onto Mars
<上一题 目录 下一题>
热门 试题

单项选择题
What is the typical trend of businesses today
A．To take in more foreign funds.
B．To invest more abroad.
C．To combine and become bigger.
D．To trade with more countries.
单项选择题
Toward the new business wave, the writer's attitude can be said to be ______.
A．optimistic
B．objective
C．pessimistic
D．biased
相关试题