语法练习

1.Starting with the ___ that there is life on the planet Mars, the scientist went on to develop his argument.

A.premise

B.pretext
C.foundation

D.presentation

2.After several nuclear disasters, a ___ has raged over the safety of nuclear energy.

A.quarrel

B.suspicion

C.verdict

D.controversy

3.Their diplomatic principles completely laid bare their ___ for world conquest.

A.admiration

B.ambition

C.administration

D.orientation

4.Nowhere in nature is aluminum found free, owing to its alawys ___ with other elements, mostcommonly with oxygen.

A.being combined

B.having combined

C.to combine

D.combined

5.Physics is the present day equivalent of ___ used to be called natural philosophy, from ___most of present-day science arose.

A.which, what

B.that, which

C.what, which

D.what, that

答案详解

1.[A]【解析】名词词义辨析。premise意为“前途”，符合题意，而其他三个选项：pretext“借口”；foundation“基础”；presentation“陈述”。在此都不符合题意，所以答案为A项。句意：以火星有生命这一前提开始，那位科学家继续深入他的论证。

2.[D]【解析】名词词义辨析。controversy意为“争论”，其他三个选项：quarrel“争吵，吵架”；suspicion“猜疑，怀疑”；verdict“判决，结论”。所以答案为D项。句意：几起核灾难之后，关于核能安全的问题引起了激烈的争论。

3.[B]【解析】名词词义辨析。ambition意为“野心”，其他三个名词的意思是：admiration“赞美”；administration“行政，管理”；orientation“方位，方向”。因此只有B项符合题意。句意：他们的外交原则将他们要征服世界的野心彻底暴露。

4.[A]【解析】被动语态。owing to是介词，后应接名词或动名词，根据题意，应接被动语态。句意：由于铝总是和其他元素结合在一起，最常见的是和氧气结合在一起，所以自然界中哪里也不会找到单质的铝元素。

5.[C]【解析】定语从句。what used to be called作定语，修饰natural philosophy，from which引导一个非限制性定语从句。句意：当今的物理就是以前被称之为自然哲学的等同物，大多数现代科学都产生于自然哲学。