Passage 7

    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 beyond the earth´s gravitational pull and __2 __them on the moon. We have now become travelers space.

    Impressive and complex __3__ it may appear, the rocket, which was invented in China over 800 years __4__ , is a relatively simple device. Fuel that is __5__ in the rocket engine changes into gas. The hot and rapidly __6__ gas must escape, but it can do so only through an opening that __7__ backward. As the gas is radiated with great force, it __8__ the rocket in the opposite direction. Like the kick of a gun that it is fired, it __9__ the laws of nature described by Sir Isaac Newton when he discovered that “for every action, there is __10__ equal and opposite reaction.”

    1. A. shown B. been C. appeared D. proved

    2. A. send B. land C. take D. carry

    3. A. that B. so C. as D. sometimes

    4. A. in advance B .before C. earlier D. ago

    5. A. round B. contained C. stored D. burned

    6. A. heating B. escaping C. expanding D. conducting

    7. A. turns B. goes C. faces D. directs

    8. A. attracts B. leads C. pulls D. pushes

    9. A. states B. proves C. follows D. breaks

    10. 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】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.

    3.【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。

    4.【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。” 句中謂語(yǔ)是一般過(guò)去時(shí)，故應(yīng)選D. ago。

    5.【答案】D

    【解析】根據(jù)句子意思判斷，burned正確。

    6.【答案】C

    【解析】根據(jù)句子意思判斷，應(yīng)選expanding gas膨脹的氣體。

    7.【答案】C

    【解析】faces意為“朝著”。

    8.【答案】D

    【解析】根據(jù)句子意思判斷，應(yīng)為push“推”。

    9.【答案】C

    【解析】根據(jù)句子意思判斷, follow在這里是遵循的意思。

    10.【答案】B

    【解析】根據(jù)上下文,只能用不定冠詞an。