海水中硫元素的主要存在形式是 . (A)S2- SO42-——青夏教育精英家教网—

2.海水中硫元素的主要存在形式是____。

(A)S^2-　 (B)S 　(C)SO₄^2-

1.假定20000粒大米为1kg，则阿佛加德罗常数粒大米给全世界60亿人均分，每人可分到大约____吨。

(A)五百万　 (B)三百万　 (C)五十万　

Keys: I. 1-5　 CACCD　　 6-10 BDCBA　　 11-15 DACCD
Keys: II. 1. arrived, had prepared　 2. have performed, had never even spoken　 3. had already begun, was, was　 4. turned, heard, had not heard, brought　　　 5. entered, didn’t recognize, had lost　　 6. had virtually disappeared, arrived　　 7. have visited, came, had never heard

15. John, a friend of mine, who got married only last week, spent $3,000 more than he _______ for the wedding. (2006全国II) 　 A. will plan　　　 B. has planned　　　 C. would plan 　 D. had planned

14. I was giving a talk to a large group of people, the same talk I_______ to a dozen other groups. (2006湖南)

A. was giving　　 B. am giving　　　 C. had given　　 D. have given　　

13. The young girl sitting next to me on the plane was very nervous. She 　　　　　　before.

(2006广东)

　　 A. hasn't flown　　　　 B. didn't fly　　　　 C. hadn't flown　　　 D. wasn't flying

12. When the old man ______ to walk back to his house ,the sun _____ itself behind the mountain. (2005湖北卷)

　　　 A．started ;had already hidden　　 B．had started ;had already hidden

C．had started ;was hiding　　　　 D．was starting; hid

11. He _________ more that 5,000 English words when he entered the university at the age of 15.(2005北京卷)

　 A. has learned　　　　　 B. would have learned　 C. learned　　　　　　　 D. had learned

10. ---Dad, do you know I had long been looking forward to your staying with me for the last weekend?

　 ---Sorry, son. I ______, but I was just too busy.

　 A. had really wanted to　　 B. have planned to　　 C. have intended to　 D. had hoped me to

9. I ______ Bill this morning, but I ______ him since.

　　A. have seen; haven’t seen　　　 B. saw; haven’t seen

　 B. saw; didn’t see　　　　　　　 D. had seen; haven’t seen

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