Unit 3
To find out what the weather is going to be, many people go straight to the radio, television or newspaper to get an expert weather forecast. But 1 you know what to look for, you can use your own 2 to make your weather 3 .
There are many 4 that can help you. For example, in fair weather the air pressure is 5 low. The air is still and often full of dust. Far away objects may look 6 . But when a storm is gathering, the pressure 7 and you are often able to see things more clearly. Sailors 8 of this long ago and came 9 with a saying “The farther the sight, the nearer the rain”.
Your sense of 10 can also help you detect weather changes. Just 11 it rains, odors become stronger. This is 12 odors are suppressed in a fair, high-pressure center. When a bad weather low 13 , air pressure lessens and smells are 14 .
You can also 15 an approaching storm. Sounds 16 heavy storm clouds and return to earth with force. An old saying describes it 17 : “Sound traveling far and wide, a stormy day will come.”
And don’t laugh if your grandmother says she can 18 a storm coming. It is commonly known that many people feel pains in their bones when the humidity 19 , the pressure drops, and bad weather is on the 20 .
1. A) unless B) if C) as D) though
2. A) experiences B) ways C) senses D) feelings
3. A) broadcast B) plans C) prediction D) statement
4. A) forms B) signals C) expressions D) signs
5. A) ordinarily B) unusually C) commonly D) generally
6. A) misty B) small C) clear D) big
7. A) rises B) drops C) increases D) descends
8. A) took care B) took note C) got hold D) made sense
9. A) up B) over C) upon D) on
10. A) touch B) taste C) smell D) sight
11. A) when B) as C) after D) before
12. A) why B) because C) how D) hence
13. A) moves away B) takes up C) moves in D) takes in
14. A) released B) controlled C) checked D) roused
15. A) learn B) see C) hear D) look
16. A) jump up B) jump down C) bounce in D) bounce off
17. A) as meaning B) following C) this way D) that is
18. A) see B) hear C) feel D) tell
19. A) falls B) grows C) drops D) rises
20. A) way B) march C) road D) moving
Unit 4
We all know that it is possible for ordinary people to make their homes on the equator(赤道), although often they may feel 1 hot there. Millions do it. But 2 the North Pole — we know that it is not only a dangerously cold place, but that people like you and me would find it quite 3 to live there. At the present time only the scientists and explorers can do 4 , and they use special equipment. Men 5 across and around the equator on wheels. 6 their feet or in ships for thousands of years; but only 7 men, with great difficulty and in very recent time, have ever crossed the ice to the North Pole. So it may 8 you to learn that, when traveling 9 , it is really safer to fly over the North Pole 10 over the equator. Of course, this is not true 11 landings in the polar region (which passenger aeroplanes do not make), but the weather, if we are flying at a 12 of 5,000 metres above the Pole, is a delight. At 4,000 metres and more 13 the earth you can always be sure that you will not see a cloud in the sky as 14 the eye can reach. In the tropics(熱帶), on the other hand, you are not certain to keep 15 bad weather even at such heights as 18,000 metres.
Aeroplanes can’t climb as 16 as or as quickly in cold air as in warm. 17 can clouds. In practice, this is an advantage 18 the aeroplane, which is already at a good height 19 it reaches the polar region and so does not need to climb, 20 at the same time cold air keeps the clouds down low.
1. A) comfortably B) uncomfortably C) discomfort D) comfort
2. A) to B) for C) as for D) of
3. A) impossible B) possible C) capable D) able
4. A) it B) so C) this D) all
5. A) traveled B) had traveled C) was traveling D) have been traveling
6. A) On B) By C) With D) Under
7. A) many B) much C) a few D) few
8. A) be pleased B) surprise C) please D)be surprised
9. A) in space B) under the sea C) by ship D) by air
10. A) than B) that C) to D) from
11. A) of B) for C) about D) from
12. A) distance B) length C) place D) height
13. A) over B) above C) under D) below
14. A) far as B) long as C) soon as D) good as
15. A) in touch with B) record of C) clear of D) up with
16. A) height B) high C) far D) soon
17. A) Nor B) So C) Either D) Neither
18. A) for B) over C) from D) to
19. A) which B) where C) while D) when
20. A) where B) while C) which D) when
