551] --What’s the matter? You really look down. --_____ . --Well, better luck next time.

[译文] --　你怎么啦？　你看起来情绪低落。--　一次重要的考试没及格。--喔，下次好运。

　 A. Why, I always look up to you 　 B. I failed an important test

　 C. I have a bad cold 　 D. Me? I never look down upon anybody

[答案及简析] B。 look down意为"情绪低落"，下句"望你下一次走好运"与"考试不及格"相吻合，故正确答案为B。

550] The popular singer who had been praised very highly _______ to be a great disappointment.

[译文] 这个评价很高的著名歌手后来证明是一个巨大的失望。

　 A. turned in 　 B. turned out

　 C. turned up 　 D. turned down

[答案及简析] B。 turn out 证明是，后来证明是。

549] Now you live in an important year _____, harder than ever before in your life, you should work.

[译文] 现在你生活在一个重要的年代，一个你应该工作，比以往任何时候都努力的年代。

　 A. that 　 B. as

　 C. when 　 D. because

[答案及简析] C。 定语从句。

548] ______ was the situation we were facing .

[译文] 这就是我们将面临的形势。

　 A. So 　 B. Such

　 C. What 　 D. It

[答案及简析] B。 such 是代词，代替前面提到的事物。

547] ----- I tried my best. 　-------Yes, but ______ .

[译文] --我尽力了。　　--是的。但是老板看来不满意。

　 A. the boss didn’t seem satisfied　　 B. the boss seemed that he was not satisfied

　 C. it seemed not to have satisfied　　 D. it looked that the boss was not satisfied

[答案及简析] A。 seem 后面可以跟形容词做表语。

546] It passes through their bodies, only _____ a little thicker and sweeter.

[译文] 它径直穿过它们的身体，最后变得越来越稠越来越甜。

　 A. getting 　 B. to get

　 C. got 　 D. having got

[答案及简析] A。 表示伴随。

545] If you _____ it , I will lend the book to you.

[译文] 如果你愿意读的话，我会把书借给你的。

　 A. read 　 B. will read

　 C. have read 　 D. were reading

[答案及简析] B。 will在条件状语从句中不是助动词而是情态动词，表示"愿意"。

544] The cost of oil is less than _______ of gas.

[译文] 油的费用比气的费用低。

　 A. it 　 B. one

　 C. the one 　 D. that

[答案及简析] D。 在比较级中用that来代替前面提到过的不可数名词。

543] He is too careless and he _______ keys.

[译文] 他太粗心了，老是掉钥匙。

　 A. always lost 　 B. always loses

　 C. is always losing 　 D. will always lose

[答案及简析] C。 is always doing sth. 是一个句型，"老是做…"。

542] Please write your composition ________ line to leave space for the teacher’s correction .

[译文] 请隔行写你的作文以便留下空间供老师评改。

　 A. one another 　 B. every other

　 C. any other 　 D. each other

[答案及简析] B。 every other line 隔行。