新概念英语选择题答案-新概念英语选择题：Lesson43Aretherestrangersinspace

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Multiple choice questions 多项选择题

Choose the correct answers to the following questions.

Comprehension 理解

1，The possibility that life exists on other planets is almost certain because ______ .

a.there are plenty of planets like our own

b.the other planets in our solar system are unlikely to support life

c.our own galaxy is so large

d.of the sheer number of planets in the universe

2，According to the writer, ____.

a.there is a possibility that we constantly have visitors from outer space

b.our planet may have been visited at some time during the distant past

c.an automatic messenger was left on our planet at some time in the past

d.our civilization is just awakening and is of interest to other beings

3，Travel in the universe is difficult because ____.

a.even at the speed of light, distances are immense

b.light travels at 186,000 miles per hour

c.planets are 100 light years away

d.there are no rockets in the universe powerful enough

4，The discovery of the natural frequency of emission of hydrogen atoms in space is important because ________.

a.it's a precise radio frequency of 1420 megacycles per second

b.it would be universally recognized by intelligent life anywhere in the universe

c.it makes the discovery of intelligent life elsewhere virtually certain

d.hydrogen is abundant exclusively in our own solar system

Structure 句型

1，Life ______ present on a planet approximately like our own. (11.1-2)

a.was

b.might be

c.must be

d.is

2，Why have we had no visitors from outer space_____ ? (11.13-14)

a.before

b.in the past

c.so far

d.till then

3，They were not ______our primitive state. (1.15)

a.interesting to (6) interesting in

c.interested to

d.interested in

4，We have no chance ______by our own primitive chemical rockets. (11.26-27)

a.to be transporting

b.to transport

c.of transporting

d.of being transported

Vocabulary词汇

1，They are_____ to have planets like our own.(11.5-6)

a.almost certain

b.obliged

c.required

d.due

2，What impression they would get of us is best left _____.(11.19-20)

a.unspoken

b.untold

c.unmentioned

d.unrecounted

3，We come up against the most difficult of all obstacles to ____people.(1.21)

a.speaking to

b.being in touch with

c.touching

d.reaching out to

4，This depends on the _____radio frequency of the 21cm wavelength. (11.30-31)

a.measurable

b.exact

c.established

d.known

新概念英语选择题：Lesson43 Are there strangers in space.doc

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