3.   藝術(shù)節(jié)                      

4.   圖書(shū)特賣(mài)            

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Science behind animal shakes PIGS do it. Mice do it. Dogs also do it. Kangaroos? Not so much. Why do animals shake? The .short answer is，because they’re wet. But there’s actually more to it than that - a lot more.

Firstly, scientists find out that mammals (哺動(dòng)物）save a large amount of energy by doing their cute little shakes. If they do not shake, animals, especially furry (多毛的）mammals would have to use up to 20 percent of their daily energy simply avoiding being wet.

Those that don’t, like kangaroos who shake only part of their body, usually live in desert climates (;少漠氣候)where it is very hard for them to get wet.

Secondly, not all animals shake at the same rate (速率).

Smaller animals seem to shake more quickly, 30 shakes per second for a mouse, while bears, tigers and big dogs average (平均）only about five.

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Fact

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Shake rate

Smaller animals shake more quicklv. 1800 shakes   per 4 for a mouse. Bigger animals, such as big dogs, shake far more slowly, only about   one 5 as fast as mice.

1._ 2._ 3._ 4._ 5._

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 假如你是Gina，你校擬舉行舊書(shū)特賣(mài)活動(dòng)，請(qǐng)根據(jù)下表信息，給你的朋友Helen寫(xiě)一個(gè)便條，邀請(qǐng)她一起參加該項(xiàng)校園活動(dòng)。

 

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(2)   Do you ...?

(3)   Please come to ...

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