To find out what the weather is going to be, most people go directly to the television, the radio or newspaper to get a weather

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问题    To find out what the weather is going to be, most people go directly to the television, the radio or newspaper to get a weather forecast. But【C1】______you know what to look for, you can use your own【C2】______to make weather predictions.
   There are many【C3】______which can help you. For example, in fair weather the air pressure is generally【C4】______. The air is still and often full of dust. Faraway objects may look【C5】______. But when a storm is gathering, the pressure【C6】______and you are often able to see things【C7】______clearly. Sailors took note of this long ago and came【C8】______with a saying "The farther the sight, the nearer the rain."
   Your sense of【C9】______can also help you find weather changes. Just【C10】______it rains, odours become stronger. This is【C11】______odours are suppressed in a fair, high-pressure center. When a bad weather low moves【C12】______, air pressure lessens and odours are【C13】______.
   You can also hear a(n)【C14】______storm. An old saying【C15】______it this way: "Sound travelling far and wide, a stormy day will betide."
   And don’t【C16】______if your grandfather says he can【C17】______a storm coming. It is commonly known【C18】______many people feel pains in their bones when the humidity【C19】______, the pressure drops, and bad weather is on the【C20】______.
【C11】

选项 A、why
B、because
C、how
D、when

答案B

解析 考查上下文关系。由文意不难看出,这一句是解释前面一句说气味变得更强烈的原因,故选引出原因的because。why后引出的是结果;how引出方式;when引出的是时间。
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