Question

【题目】 Polar bears(北极熊) are in great danger. And human beings are possibly the cause of the danger. As we burn gas to produce electricity or get us around town in our cars and trucks, we create tons of carbon dioxide (二氧化碳). This is causing global warming.

Polar bears need sea ice to live because the ice is their hunting ground. The bears’ main source of food is the meat of seals(海豹). These animals come to surface holes in the ice to breath. It is there that the polar bears catch the seals. Without any ice, there is nowhere for bears to hunt. The seals hardly come onto the land and spend their time out on the sea ice.

In recent years, the seal ice has disappeared in the Arctic during the late summer. This is dangerous for the polar bears, as they depend almost only on seals for food. Unlike brown and black bears, polar bears do not hibernate(冬眠) during the winter. Only female polar bears will go into a “little house” and stay for a long time if they are giving birth to baby bears.

It may be strange to think about, but winter is the time for polar bears to get food while summer is the time of hunger. The bears have got used to a cold world, and they need the low temperatures in order to stay alive. If the world continues to warm up and sea ice is absent for longer and longer periods of time, polar bears might unluckily go the way of dinosaurs (恐龙).

【1】Because of human beings, all the bears in the world are facing great danger now.

【2】If there are no seals on the sea ice, polar bears may have no food to eat.

【3】Unlike brown and black bears, only female polar hibernate in winter.

【4】Polar bears can get much more food in summer than in winter.

【5】Global warming may make polar bears die out in the future.

Answer 1

【答案】

【1】B

【2】A

【3】B

【4】B

【5】A

【解析】

本文主要讲述北极熊现在处于危险之中，人类可能是造成这种结果的原因，如果北极熊的处境越来越糟，它们很可能会重蹈恐龙灭绝的覆辙。

【1】细节理解题。根据第一段中“Polar bears(北极熊) are in great danger. And human beings are possibly the cause of the danger.”可知，人类可能是造成北极熊处于极大危险中的原因，并不确定是造成这种危险的原因。该项表述错误，故选B。

【2】推理判断题。根据“This is dangerous for the polar bears, as they depend almost only on seals for food.”可知，北极熊几乎只以海豹为食。所以如果海冰上没有海豹，北极熊可能就没有食物可吃了。该项表述正确，故选A。

【3】细节理解题。根据“Unlike brown and black bears, polar bears do not hibernate(冬眠) during the winter. Only female polar bears will go into a “little house” and stay for a long time if they are giving birth to baby bears.”可知，母北极熊在生熊宝宝的时候才会进入“小房子”待很长一段时间，并不是在冬眠。该项表述错误，故选B。

【4】推理判断题。根据“It may be strange to think about, but winter is the time for polar bears to get food while summer is the time of hunger.”可知，冬天是北极熊觅食的季节，而夏天是饥饿的季节。所以推测北极熊在冬天比在夏天能得到更多的食物。该项表述错误，故选B。

【5】推理判断题。根据“If the world continues to warm up and sea ice is absent for longer and longer periods of time, polar bears might unluckily go the way of dinosaurs (恐龙).”可知，如果世界继续变暖，海冰消失的时间越来越长，北极熊可能会不幸走上恐龙的道路。所以推测全球变暖可能使北极熊在未来灭绝。该项表述正确，故选A。