2. 外语
  3. 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

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】______.
【C1】
选项 A、if
B、unless
C、though
D、as
答案A
解析 考查上下文关系。由空格前But所表示的与前面一句话在意思上的转折及后面几段表示的意思可知这里应当指一种假设，故选if。其余三项都不合上下文逻辑。
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