2. 外语
  3. The water cycle is a exciting and continuous process. 【S1】______ The warm sun causes water on Earth t

The water cycle is a exciting and continuous process. 【S1】______ The warm sun causes water on Earth t

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问题     The water cycle is a exciting and continuous process.                            【S1】______
The warm sun causes water on Earth to vapor, that is,                                 【S2】 ______
to change into a gas and rise up into the sky. This is how forms                  【S3】______
clouds that float in the sky. Clouds can be mass of water droplets or            【S4】______
ice particles. When the clouds get heavier enough, the water falls                【S5】 ______
back to the earth. The water vapors must turn into a liquid or solid             【S6】______
after it can fall to the earth. When the water falls back to the earth          【S7】______
it is called precipitation. The water may fall in rain, snow, or hail.          【S8】______
Plants in our environment also sends water vapor into the                         【S9】 ______
atmosphere. When plants do this it is called transpiration.                       【S10】______
选项
答案a—an
解析 水循环是一个令人兴奋、持续不断的过程。因为形容词exciting的开头音标是元音，按照语法应用不定冠词an而非a。
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