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When the natural climate changes due to ...

    When the natural climate changes due to global warming, it can surely affect seals (海豹). The majority of them live in the Antarctic region but the ice is melting and their natural habitat can be seriously affected. These changes don’t take place overnight. They can be the result of many years of additional temperatures in the area. The seals then have to find ways to adapt.

Seals depend on the cool air currents to bring plenty of food for them. When the temperatures get higher there is less and less food and the seal population starts to get depleted. Mothers are not healthy enough to feed their babies. Many of them end up abandoned as the mothers have to leave to find their own source of food.

The fact that their desire to produce young can be changed and the warmer temperature is frightening too. It is also believed that the warmer temperature can allow different diseases and viruses to attack the seals. This is a huge concern as they can rapidly wipe out huge numbers of seals out there.

However, these changes in climate and temperature aren’t all bad for other species of seals. Scientists have found that those living in warmer climates are producing more young due to the changes. Research also shows that the females are moving further to find food and water. When they are out of the reach of the governing males, they are more willing to accept the moves of other males in the group.

This is good news too because it means that there will be more selection in the gene pool (基因库) for future generations. It can help the seals as a species adapt to change in their natural environment more easily.

The climate change problem for seals is directly linked to humans. When we take action to change what we let out into the environment, we will make positive changes for the seals. However, it is going to take a very long time to reverse (彻底改变) the effects of what has already been done.

1.What does the author regard climate changes for seals as?

A.A mirror of evolution.

B.A double-edged sword.

C.An unavoidable disaster for existence.

D.A requirement for more choice in the gene pool.

2.What does the underlined phrase in paragraph 2 probably mean?

A.Explode. B.Vary.

C.Disappear. D.Decrease.

3.What will happen to the seals in warmer climates?

A.The female seals will be in the lead.

B.Their genes will change a great deal.

C.Their number will be on the increase.

D.The females will keep away from the males.

4.What’s the main idea of the text?

A.How climate change affects seals. B.The importance of protecting seals.

C.Seal’s adaptation to climate change. D.Why seals are becoming less and less.

 

1.B 2.D 3.C 4.A 【解析】 本文是说明文。详细介绍了气候变化对海豹的消极影响和积极影响,呼吁人类做出积极的行动,来减少气候变化对动物的影响。 1. 推理判断题。根据第二段的When the temperatures get higher there is less and less food and the seal population starts to get depleted.和第三段的It is also believed that the warmer temperature can allow different diseases and viruses to attack the seals. This is a huge concern as they can rapidly wipe out huge numbers of seals out there. 可知当温度升高时,食物越来越少,海豹的数量开始减少。温度升高还会导致不同的疾病和病毒攻击海豹,这些疾病和病毒能迅速消灭大量的海豹。这些都是气候变化对海豹的消极影响。根据第四段Scientists have found that those living in warmer climates are producing more young due to the changes.第五段This is good news too because it means that there will be more selection in the gene pool (基因库) for future generations. It can help the seals as a species adapt to change in their natural environment more easily.可知由于气候变化,那些生活在温暖气候下的动物会生出更多的后代。雌性海豹的移动会导致后代基因方面有更多的选择,有助于帮助海豹适应自然环境的变化。这些是气候变化对海豹的积极影响。综上,作者认为气候变化对海豹是双刃剑。故选B。 2. 词义猜测题。根据上句Seals depend on the cool air currents to bring plenty of food for them. When the temperatures get higher there is less and less food可知海豹依靠凉爽的气流为它们带来大量的食物。当温度升高时,食物就越来越少。由此推知食物减少对海豹数量的影响就是数量减少。get depleted与decrease同义,指减少。故选D。 3. 细节理解题。根据第四段Scientists have found that those living in warmer climates are producing more young due to the changes.可知科学家们发现,由于气候变化,那些生活在温暖气候下的海豹会生出更多的后代,即海豹的数量会增加。故选C。 4. 主旨大意题。第一段When the natural climate changes due to global warming, it can surely affect seals (当全球变暖导致自然气候变化时,它肯定会影响到海豹)是全文的主题句,结合全文内容,可知本文详细介绍了气候变化对海豹的消极影响和积极影响,即本文的主题是“气候变化如何影响海豹”。故选A。
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