2017年12月英语四级听力答案:试卷一听力篇章1(沪江网校版)
作者:沪江网校
来源:沪江网校
2017-12-16 11:32
Section C
16. D) How space research benefits people on Earth.
17. B) They developed objects for astronauts to use in outer space.
18. C) They are extremely accurate.