5.A serious study of physics is impossible ________some knowledge of mathematics.

(2013·大纲全国，31)

A.against B.before

C.beyond D.without

答案　D

解析　句意为：不掌握一定的数学知识是没有办法对物理学进行系统地研究的。without没有，缺乏，符合句意。

6.I have an appointment ________ Dr. Smith，but I need to change it. (2013·北京，26)

A.to B.off

C.with D.from

答案　C

解析　考查介词用法。句意为：我与史密斯博士有约，但我需要做出调整。have an appointment with...与……有约，为固定搭配。

7.________everyone here，I wish you a pleasant journey back to your country.(2013·辽宁，25)

A.By means of B.On behalf of

C.In search of D.For fear of

答案　B

解析　考查短语辨析。句意为：我谨代表大家祝愿你归国旅途愉快。by means of用，凭借;on behalf of代表;in search of寻找;for fear of 唯恐。

8.Mrs. Smith finds it hard to clear up the mess，as her children are always ________ whenever she tries to. (2013·福建，29)

A.in the way B.on watch

C.in sight D.on the line

答案　A

解析　句意为：Mrs. Smith发现很难清理混乱局面，因为当她尽力清理时她的孩子总是妨碍她。in the way妨碍;on watch值班，监视;in sight在视力范围内，在即;on the line处于危险中，(对方)在接电话。

9.It was a real race ________time to get the project done. Luckily，we made it.(2013·新课标全国Ⅰ，34)

A.over B.by

C.for D.against

答案　D

解析　考查介词辨析。句意为：完成这项任务真是一场与时间的赛跑，值得庆幸的是，我们做到了。与时间赛跑，显然是对抗，用against。