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）
分类: 大学四六级英语
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.
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.