The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age. Rocket engines have 1 powerful enough to shoot astronauts 2 the earth's gravitational pull and 3 them on the moon. We have now become 4 space.
Impressive and complex 5 it may appear, the rocket, which was 6 in China over 800 years 7 , is a relatively simple device. Fuel that is 8 in the rocket engine changes 9 gas. The hot and rapidly 10 gas must escape, but it can do so only 11 an opening that 12 backward. As the gas is 13 with great force, it 14 the rocket in the 15 direction. Like the kick of a gun 16 it is fired, it 17 the laws of nature 18 by Sir Isaac Newton when he discovered that“19 every action, there is 20 equal and opposite reaction.”
1.A.shown B.been C.appeared D.proved
2.A.against B.despite C.beyond D.from
3.A.send B.land C.take D.carry
4.A.travelers B.astronauts C.researchers D.explorers
5.A.that B.so C.as D.sometimes
6.A.made B.discovered C.developed D.invented
7.A.in advance B.before C.earlier D.ago
8.A.round B.contained C.stored D.burned
9.A.as B.into C.for D.the
10.A.heating B.escaping C.expanding D.conducting
11.A.in B.at C.by D.through
12.A.turns B.goes C.faces D.directs
13.A.transmitted B.dispersed C.erected D.radiated
14.A.attracts B.leads C.pulls D.pushes
15.A.same B.other C.opposite D.wrong
16.A.that B.when C.if D.although
17.A.states B.proves C.follows D.breaks
18.A.described B.discussed C.considered D.made
19.A.like B.as C.with D.for
20.A.no B.an C.another D.the
1.【答案】D
【解析】因其后接形容詞powerful作表語(yǔ)故應(yīng)填系詞。shown不是系詞;been和appeared雖可作系詞但與句意不符;而proved可作系詞，意為“證明是”，符合句意。
2.【答案】C
【解析】根據(jù)意思判斷，beyond意為“超出，超過(guò)”。
3.【答案】B
【解析】因land on意為“使……著陸”,而send, take和carry表示“把……送到……上去”時(shí),常接介詞to,故應(yīng)選land.
4.【答案】A
【解析】根據(jù)意思判斷，travelers正確.
5.【答案】C
【解析】原句是表示讓步的狀語(yǔ)從句，而且是一個(gè)倒裝句，故只能選C as。
6.【答案】D
【解析】根據(jù)詞的意思區(qū)分，invented(指發(fā)明)合乎題意。
7.【答案】D
【解析】該句為which引導(dǎo)的定語(yǔ)從句，意為“中國(guó)發(fā)明火箭是在距今800多年前?！本渲兄^語(yǔ)是一般過(guò)去時(shí)，故應(yīng)選D. ago。
8.【答案】D
【解析】根據(jù)句子意思判斷，burned正確。
9.【答案】B
【解析】change into是固定短語(yǔ)，“變成”的意思。
10.【答案】C
【解析】根據(jù)句子意思判斷，應(yīng)選expanding gas膨脹的氣體。
11.【答案】D
【解析】through的意思為“穿過(guò)，通過(guò)”。
12.【答案】C
【解析】faces意為“朝著”。
13.【答案】D
【解析】transmit意為“傳遞”，disperse意為“驅(qū)散”，erect意為“直立，挺直”，radiate意為“輻射，向各方向伸展”，只有D合題意。
14.【答案】D
【解析】根據(jù)句子意思判斷，應(yīng)為push“推”。
15.【答案】C
【解析】朝相反的方向，故選C。
16.【答案】B
【解析】when引導(dǎo)的定語(yǔ)從句。
17.【答案】C
【解析】根據(jù)句子意思判斷, follow在這里是遵循的意思。
18.【答案】A
【解析】根據(jù)句子意思判斷，describe是“記載描述”的意思。
19.【答案】D
【解析】for是“對(duì)于”的意思。
20.【答案】B
【解析】根據(jù)上下文,只能用不定冠詞an。