stairs.
a. come up b. to come up c. went up d. goes up
5. when Grandma turned 85, her eyes began to ___ d. fail
6. the people who lived near the river had to __ the flooding waters. c. flee
7. I am busy at the moment. You can put the book ___ you like. c. wherever
8. I wonder if there is anything ___ for you.
a. I can do b. which I can do
9. don’t be too nervous. Dr. Smith will__ your health.
a. look after b. worry about c.
check on
10. it seems that the picture is not hanging ___ it should on the wall. b. where.
1. The mobile medical team
comprises five doctors and eight nurses.
2. Before we go there it would be
just as well to telephone them.
3. people tend to become
irrational in an emergency. 4. all through the interview he
carefully avoided the subject of salary.
5. Susan acknowledged that it
was too late to help Tom now.
6. when you are learning to drive,
having a good teacher will make all the difference.
7. I like to go to the movies
with my old friends now and then.
8. his success is entirely due to
his hard work.
Unit 3 Are there strangers in space?
We must conclude from the work of those who have studied the origin of life, that given a planet only approximately like our own, life is almost certain to start. Of all the planets in our own solar system, we are now pretty certain the Earth is the only one on which life can
survive. Mars is too dry and poor in oxygen. Venus far too hot, and so is Mercury, and outer planets have temperatures near absolute zero and hydrogen-dominated atmospheres. But other suns, stars as the astronomers call them, are bound to have planets like our own, and as the number of stars in the universe is so vast, this possibility becomes virtual certainty. There are one hundred thousand million stars in our own Milky Way alone, and then there are three thousand million other Milky Ways , or galaxies, in the universe. So the number of stars that we know exist is now estimated at about 300 million million million.
If we are so certain that other intelligent life exists in the universe, why have we had no visitors from outer space yet? First of all, they may have come to this planet of ours thousands or millions of years ago, and found our then prevailing primitive state completely uninteresting to their own advanced knowledge. Professor …, a leading American radio astronomer, argued in Nature that such a superior civilization , on a visit to our own solar system, may have left an automatic messenger behind to await the possible awakening of an advanced civilization.
Such a messenger, receiving our