2017年公共英語四級考試閲讀衝刺題

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　　Use of English

Read the following text. Choose the best word or phrase marked A,B,C or D for each numbered blank.

Nearly three-quarters of the earth is covered with water. Water heats up more slowly than land, but once it has become warm, it takes longer to_1_down. If the earth’s surface were entirely land, the temperature at night would_2_quite quickly and night would become cooler than the day, as it is on the moon. This does_3_happen in inland deserts, the temperate_4_, is very much affected by the oceans around them. The areas close to the sea have a “maritime climate”, _5_rather cool summers and warm winters. The interiors, far from the sea, have a_6_climate with extremely hot summers and cold winters.

Rain_7_from the evaporation of rivers, seas and lakes. Even after heavy rain the pavements in the city do not take long to dry_8_the rainwater evaporates into the air. on a warm dry day it evaporates very rapidly, _9_warm air can absorb more moisture than cold air. But at any particular temperature, the_10_can hold only a certain maximum amount of water vapor. The air is then saturated like a sponge that can not hold_11_more water. The lower the temperature, the_12_ water vapor is required to saturate the air.

All over the surface of the earth, millions of tons of water are_13_every second, condensing in the air into drops so small_14_it takes thousands of them to make a single raindrop. It is these_15_ droplets that make clouds. When clouds roll in from the sea over the warmer land, they are forced to_16_and become cooler in the colder atmosphere. As the air cools sown, it may pass through its saturation point and_17_some of its water vapor turns to rain. Day in , day out,the_18_water circulates between the air and the land:rivers_19_to make clouds, clouds make rain, rain makes rivers which in turn run into the sea. This is called the rain_20_.

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