506] ______ metals are good conductors, silver ______ the best conductor of all.

[译文] 几乎所有的金属都是导体，银在其中是最好的。

　 A. Almost, being 　 B. Almost all, being

　 C. Almost, is 　 D. Almost all, to be

[答案及简析] B。 独立主格结构。

505] Instead, he seemed to see Tom ’s face, with the wide smile he ______ whenever he told a joke.

[译文] 相反，她似乎看到了Tom的脸，一张带着他任何时候讲笑话时微笑的脸。

　 A. wore 　 B. brought

　 C. appeared 　 D. carried

[答案及简析] A。 带着微笑，英语中wear a smile一般用表示。

504] ----- I can ’t see the words on the blackboard clearly. ----- Why, your eyes need _____ perhaps you need _______ glasses.

[译文] --黑板上的字我看不清楚。　--啊，你的眼睛需要检查，或许你需要戴副眼镜。

　 A. to examined, to wear　　 B. to examine ,to wear　

　 C. to be examined, to wear 　 D. examining, wearing

[答案及简析] C。 need作为实意动词，表示需要时，一般用动名词的主动形式或者不定式的被动形式表示被动意义。

503] The typewriter _______ all week.

[译文] 桌上的打字机放在这儿已经一周了。

　 A. laying on the table, were it had laid 　

B. lying on the table, were it had laid

　 C. laying on the table, were it had laid 　

D. lying on the table had been laid

[答案及简析] D。 lying on the table现在分词短语作定语，该句是一个被动语态。

502] This is the plane _______ he went to Shanghai ______ business.

[译文] 这就是他到上海出差乘坐的飞机。

　 A. where, for a 　 B. by which, on the

　 C. in which, on 　 D. where, on

[答案及简析] C。 定语从句中表示方式一定要注意：by which = by the plane 所以只有in which = in the plane是正确的。

501] ______ that she should come here on time.

[译文] 她今天准时到这儿来就好了。

　 A. Suppose 　 B. Demand

　 C. Think 　 D. Believe

[答案及简析] A。 Suppose表示假设，后面的从句用虚拟语气。

500] At no point south of the Han River _______ more than a mile.

[译文] 敌军在汉河南岸前进了一英里多。

　 A. the enemy didn’t advance 　 B. the enemy advanced

　 C. did the enemy advance　　 D. didn’t

[答案及简析] C 表示地点的状语在句首，主句要部分倒装。

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499] Only at that time ______ that he had made a lot of mistakes in his homework.

[译文] 知道那个时候他才意识到他的家庭作业中出了很多错误。

　 A. He realized 　 B. did he realize

　 C. he did realized 　 D. realized he

[答案及简析] B。 only引导的状语在句首，主句要部分倒装。

498] He ______ prison two years ago and now he _______.

[译文] 两年前他悲观进监狱，现在被释放了。

　 A. was put in; was set free 　 B. was shut into, is set free

　 C. put into, has been set freely 　 D. was put into; has been set free

[答案及简析] D。 put sb. into prison　；set sb. free都是固定搭配。

497] _______ the two oceans the Pacific is ______ .

[译文] 在这两个大海中，太平洋是最大的一个。

　 A. In; the large 　 B. For; larger

　 C. Of; larger 　 D. Of, the larger

[答案及简析] D。 在两个当中的比较级，要用介词of。