15. A) killing time B) having a good time C) enjoying D) enjoying himself
16. A) as B) different C) like D) unlike
17. A) real B) true C) actual D) loyal
18. A) live with B) stay with C) stay away from D) are helpful to
19. A) inviting B) introducing C) lead D) being acquainted
20. A) to recognize B) to have known C) of recognizing D) of knowing
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.
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