单项选择题

A．They are a group of astronauts.
B．They are several scientists who are interested in the moon.
C．They are a group of scientists and engineers who study Mars.
D．They are NASA staff.
<上一题 目录 下一题>
热门 试题

单项选择题
What is the best rifle of the passage
A．The perils of prosperity
B．Fruits of affluence
C．Growth and its social effects
D．Prosperity and environment
单项选择题
The author introduces Martin Hughes at the beginning of the passage ______.
A．to show he and his wife are both environmentally conscious
B．m serve as the background of his life story
C．to introduce the topic of "green tag"
D．to encourage the readers m follow suit
相关试题