单选题
英语四级
2017-12-16
Questions 16 to 18 are based on the passage you have just heard.
第16题答案________
A．When America's earliest space program started.
B．When the International Space Station was built.
C．How many space shuttle missions there will be.
D．How space research benefits people on Earth.
参考答案
D
答案解析
暂无解析
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A．They accurately calculated the speed of the orbiting shuttles.
B．They developed objects for astronauts to use in outer space.
C．They tried to meet astronauts' specific requirements.
D．They tried to make best use of the latest technology.
A．They are extremely accurate.
B．They are expensive to make.
C．They were first made in space.
D．They were invented in the 1970s.
A．It was when her ancestors came to America.
B．People had plenty of land to cultivate then.
C．It marked the beginning of something new.
D．Everything was natural and genuine then.