1. Although the sun is the prime mover of our weather, it is forever unpredictable.

(A)primary (B)first-rate (C)first

2. Seamounts(海山), conical elevations formed beneath the ocean, are the mostprominent formations on the ocean bottom.

(A)battered (B)ancient (C)conspicuous

3. It is generally believed that the principal ancestor of the domestic cat is the Libyan desert cat.

(A)chief (B)official (C)only

4. Geneticist Barbara McClintock discovered that genes, which prescribe the function of cells in plants and animals, can move in unpredictable ways.

(A)inhibit (B)mimic (C)dictate

5. Because light travels more quickly than sound, a rumble of thunder never precedes a bolt of lightning.

(A) follows (B) accompanies (C) comes before

6. The Social Insurance Number (SIN) card is the primary mode of identification for Canadians.

(A) principal (B) original (C) prior

7. Prior to the use of nickel in 1835, spoons were made exclusively of silver or pewter.

(A) Before (B) In (C) At the time of

8. The preliminary carving of Iroquois(易洛魁族人)masks was done on living trees because it was believed that by this means the masks would also have life.

(A) initial (B) ceremonial (C) careful四级作文

9. The biologist needed more proof before her theory could be accepted.

(A) financing (B) publications (C) evidence

10. When David came late, the teacher warned that he must be prompt.

(A) precise (B) opportune (C) punctual

答案：ACACC AAACC

详解：

1、primary

adj. 主要的;初级的;基本的

n. 原色;最主要者

Our company has targeted career women as our primary customers.

我们公司将职业妇女作为主要客源。

2、conspicuous

adj. 显著的;显而易见的

She is a conspicuous figure.

她是个引人注目的人物。

3、chief

n. 首领;酋长;主要部分

adj. 首席的;主要的;主任的

adv. 主要地;首要地

The chief handicrafts of this country are pottery and wood carving.

这个国家的主要手工艺是制陶和木雕。

4、dictate

vt. 命令;口述;使听写

vi. 口述;听写

n. 命令;指示

You have to eat what your parents feed you and sleep when they dictate.

父母决定你每天吃什么，当他们命令你睡觉时你不得不上床。

5、comes before

位于…之前;在…之上;比…重要

The darkest hour comes before dawn.

黎明之前，是最黑暗的时刻。

6、principal

adj. 主要的;资本的

n. 首长;校长;资本;当事人

Today the principal tools for prospecting the brain are electrical.

当今探查人脑的主要工具是用电的。

7、Before

prep. 在…之前，先于

adv. 以前;在前

conj. 在…以前;在…之前

I have seen him before.

我以前曾经见到过他。

8、initial

adj. 最初的;字首的

vt. 用姓名的首字母签名

n. 词首大写字母

After initial logarithmic progress growth plateaued sharply.

初期的上升进程之后，发展陡然平稳下来。

9、evidence

n. 证据，证明;迹象;明显

vt. 证明

Let me adduce more evidence.

让我举出更多的证据。

10、punctual

adj. 准时的，守时的;精确的

He piqued himself on being punctual.

他对于自己能准时而感到骄傲。