Question

    Cara Clarkson and her family were overjoyed when spotting two young grizzly bears (灰熊) — one with rarely seen all-white fur, alongside the Trans-Canada Highway.

“White grizzly bears are unheard of, so it was a luxury and incredible experience,” said Cara, sharing her images and videos on social media and saying that was a real treat given that the family was out celebrating her husband’s and son’s birthdays. Mike Gibeau, an animal

specialist, said the Clarksons who encountered the white bear — now called Nakoda, are truly lucky, for white grizzly bears are incredibly rare.

The expert doesn’t believe the grizzly’s white fur is a case of albinism, a disorder in which an animal fails to produce melanin, which is responsible for skin, hair, and eye color. Instead, he thinks the bear’s unusual coloring is the result of a recessive (隐性) gene (基因), the characteristics of which are often covered by those of dominant genes. However, if both parents carry the same recessive gene — in this case, one that results in white fur — it can be passed on to latergenerations.

Though this is the first time the world has seen the white grizzly, park officials, who have known of Nakoda’s existence since 2018, never publicized the unique bear due to fear that it would be heartlessly run after by fans eager to see these unusual-looking animals.

As it turns out, they were right. Nakoda’s photos and videos, which have gone viral, have led to crowds of people rushing to the bear’s current location, resulting in unsafe parking and traffic jams. The concerned officials enforced a 10-kilometer no-stopping zone, which they hope will inform visitors to travel through the area safely and to prevent these bears from getting hit on the highway.

Wildlife experts, who are trying to lead the young grizzlies away from the highway, hope to help them develop a behavior of avoidance of humans and eventually head to the forests, where they can live a long, healthy life.

1.For the Clarksons, what does “a real treat” in paragraph 2 refer to?

A.Observing two birthdays.

B.The reunion of the family.

C.Sharing their experience online.

D.The sighting of a white grizzly bear.

2.What is the main idea of paragraph 3?

A.The classification of genes.

B.The effect of a physical disorder.

C.The possible cause of the bear’s white fur.

D.The characteristics of recessive and dominant genes.

3.Why did the park officials hide Nakoda’s existence from the public?

A.To save the trouble of further explanation.

B.To protect it from crazy disturbance.

C.To stop it being mercilessly shot.

D.To avoid enthusiastic reporters.

4.What do wildlife experts expect of the young grizzlies?

A.They’ll stay where they belong.

B.They’ll ignore human activities.

C.They’ll safely cross the highway.

D.They’ll live in harmony with humans.

Answer

1.D

2.C

3.B

4.A

【解析】

本文是新闻报道。Cara一家在高速公路上遇到了罕见的白灰熊，引起了人们的关注。野生动物专家想方设法保护白灰熊不受人类的干扰，引导它们远离高速公路，在森林里过健康长寿的生活。

1.

猜测词义题。根据上句White grizzly bears are unheard of, so it was a luxury and incredible experience和下文truly lucky, for white grizzly bears are incredibly rare.可知Cara对白灰熊是闻所未闻的，她认为见到白灰熊是一次奢侈而不可思议的经历。此处用a real treat指见到了白灰熊让她们一家一饱眼福，故选D。

2.

主旨大意题。根据第三段中的The expert doesn’t believe the grizzly’s white fur is a case of albinism, …… Instead, he thinks the bear’s unusual coloring is the result of a recessive (隐性) gene (基因), the characteristics of which are often covered by those of dominant genes.可知专家不认为灰熊的白色皮毛是白化病的表现。他认为熊的不寻常的颜色是一种隐性基因，其特征通常被显性基因所掩盖。由此推知本段是分析熊的白色皮毛的可能原因，故选C。

3.

细节理解题。根据第四段park officials, who have known of Nakoda’s existence since 2018, never publicized the unique bear due to fear that it would be heartlessly run after by fans eager to see these unusual-looking animals.可知自2018年起，公园官员们就知道了Nakoda的存在，但他们从未公开过，因为担心那些希望看到这些长相奇特动物的粉丝们会无情地追逐它，即公园官员们想保护白灰熊不受疯狂的干扰。故选B。

4.

推理判断题。根据最后一段中的Wildlife experts, who are trying to lead the young grizzlies away from the highway, hope to help them develop a behavior of avoidance of humans and eventually head to the forests, where they can live a long, healthy life.可知野生动物专家正试图引导小灰熊远离高速公路，希望帮助它们养成躲避人类的习性，并最终去森林，在那里过健康长寿的生活。由此推知野生动物专家希望小灰熊生活在属于它们的地方。故选A。