Nelson Mandela _________ his life to fighting for a free society________ all people live together in harmony.
A. devoted; which B. spent; in which
C. devoted; in which D. spent; where
The number of various educational programs is increasing, _______ important roles have been realized by more and more people.
A. whose B. where C. which D. that
It is dangerous to take ________ from rain under a tree especially during a summer rainstorm.
A. cover B. shelter C. hiding D. advantage
--- What do you think of the grammar book?
--- Oh, it really is ________ useful reference book, which is worth reading ________ second time.
A. a; a B. an; the C. an; D. the; the
--Mary, remember to come and see us next time you’re in town.
---__________.
A. Why? I’ll certainly do B. Sounds nice
C. You’re welcome D. Sure, I will
请根据以下内容写一篇文章介绍中国科学家钱学森。
1.1911年生于上海，1935年赴美留学，成绩优异，受到当时的著名科学家冯·卡门(Von Karman)的赞誉；
2.1938年在美国获航空、数学博士学位；
3.1950年获悉新中国成立的消息，克服了美国政府的百般阻挠，于1955年回到祖国；
4.1958年起长期担任航空航天研究工作，为新中国的航天事业做出巨大的贡献，被誉为“新中国航天之父”；5.2009年于北京去世。
获博士学位： obtain one’s doctor’s degree
航天科技 : aerospace science and technology
为......做出巨大的贡献: contribute a lot to...
中国的航天事业:the cause of China’s areospace
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