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Blue whales are the largest animals in t...

    Blue whales are the largest animals in the world. But they are amazing _______ because of their huge size, but their slow heartbeat.

For the first time , scientists have researched the _______ of a blue whale. They found _______ when blue whales dive (潜水) for food, their heart rates (心率) are as _______ as 2 beats per () minute (bpm). Scientists used to _______ that their diving heart rate was 15 bpm. When the whales go to the ocean’s _______ to breathe, their heart rate is between 25 and 37 bpm.

Usually, the larger an animal is, _______ its heart beats, since it takes more time to pump (输送) blood around _______ body. Shrews, the smallest mammals (哺乳动物), have a heart rate of up to 1,000 bpm. Humans usually stay between 60 and 100 bpm.

_______ slowing their heart rate, blue whales can send more blood to the muscles (肌肉) that they use ________. These muscles become stronger, allowing the whales to dive for longer periods of time.

1.A.neither B.either C.not only D.although

2.A.heartbeat B.body size C.diving D.food

3.A.it B.that C.once D.if

4.A.many B.little C.fast D.slow

5.A.regard B.expect C.think D.doubt

6.A.bottom B.surface C.center D.side

7.A.the slower B.slower C.the faster D.faster

8.A.it’s B.its C.his D.her

9.A.By B.In C.On D.At

10.A.to pump blood B.to eat C.to breathe D.to dive

 

1.C 2.A 3.B 4.D 5.C 6.B 7.A 8.B 9.A 10.D 【解析】 这是一篇说明文,文章主要讲述科学家研究蓝鲸潜水觅食的时候,心跳很慢的原因。 1. 句意:但是它们很迷人,不仅是因为它们巨大的体积而且是因为它们的缓慢地心跳。 neither二者都不;either二者之一;not only不仅;although尽管。此处用的是not only…but(also)…表示“不仅……而且……”。故选C。 2. 句意:第一次,科学家研究蓝鲸的心跳。 heartbeat心跳;body size身体大小;diving潜水;food食物。根据后文“when blue whales dive for food, their heart rates”可知科学家研究的是心跳,用heartbeat。故选A。 3. 句意:他们发现当蓝鲸潜水觅食,心跳很慢每分钟跳两下。 it它,that那个;once曾经,一旦;if如果。found后面是宾语从句,用that引导从句,that在从句中没有实际的含义。故选B。 4. 句意:他们发现当蓝鲸潜水觅食,心跳很慢每分钟跳两下。 many很多;little几乎不;fast快;slow慢。根据“2 beats per minute (bpm)”可知心跳很慢,用形容词slow。故选D。 5. 句意:科学家过去认为它们的潜水心跳是每分钟15下。 regard看作,当成,侧重凭外表或表面现象作判断;expect期望;think思考,想,认为;doubt怀疑。根据“Scientists”可知此处指的是科学家的结论,用think that引出后面的宾语从句。故选C。 6. 句意:当蓝鲸到达海洋的表面呼吸的时候,它们的心跳是在每分钟25到37之间。 bottom底部;surface表面;center中心;side边。根据“to breathe”可知此处用名词surface。故选B。 7. 句意:通常一个动物越大,心跳就越慢。 the slower越慢;slower慢一点;the faster越快;faster快一点。此处是“the+比较级,the+比较级”表示“越……越……”,根据文章讲述的蓝鲸的心跳缓慢可知此处用the slower。故选A。 8. 句意:因为它花更多的时间给身体输送血液。 it’s它是;its它的;his他的;her她的。此处“an animal”可知此处用its表示“它的”。故选B。 9. 句意:通过减缓它们的心率,蓝鲸可以将更多的血液输送到它们用来潜水的肌肉中。 by通过;in在……里面;on在……上面,一……就……;at在某个点。此处是方式状语,用by doing。故选A。 10. 句意:通过减缓它们的心率,蓝鲸可以将更多的血液输送到它们用来潜水的肌肉中。 to pump blood输血;to eat吃;to breathe呼吸;to dive潜水。根据“These muscles become stronger, allowing the whales to dive for longer periods of time”可知此处指的是潜水,用动词不定式to dive。故选D。
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