Question

【题目】 September 8, 2017, was an exciting date for Katey Walter Anthony. On this cool, windless evening she first visited Alaska’s Lake Esieh. Few people visit this remote area of wilderness, covered by frozen ground with spruce trees. Thousands of lakes dot the region. But Walter Anthony quickly realized that this lake was strange. As her boat moved across it, she came to a place where the water seemed to be boiling.

The water wasn’t warm. Bubbles of all sizes streamed up, popping at the surface. One bubble, as large as a softball, gave off a loud sound as it burst. The bubbles, which rose with such force that they slowly pushed her boat to the side, covered a part of the lake larger than a football field.

Walter Anthony leaned over the edge of the boat and collected some bubbles in a bottle. Then she struck a match and opened the bottle to release the gas she had just collected. The gas caught fire!

The fire dancing over the bottle confirmed her belief. It showed that the lake was flowing out a gas called methane. Each molecule(CH4) contains one atom of carbon bonded to four atoms of hydrogen. As a strong greenhouse gas, it can absorb radiation from the sun, warming the atmosphere. Methane, along with carbon dioxide, is a major source of global warming.

Scientists believe that the Arctic could release large amounts of methane over the next 100 years. Some of them worry that this methane will cause the world to warm more quickly than they had predicted.

Walter Anthony has spent nearly 20 years trying to understand this threat. She is trying to measure how much methane is coming out of warming Arctic lakes. And to her, Lake Esieh could be a warning. If other lakes respond the same way, the Arctic could be poised to flow out far more methane than anyone had expected. “We don’t even know how much gas is down there,” she says. “It’s a wild card.”

【1】Why is Lake Esieh considered strange?

A. The water there is boiling.

B. It is located in a remote area.

C. Bubbles there give off a loud sound.

D. It is flowing out a gas that can catch fire.

【2】What effect does the gas from the lake have on the environment?

A. It warms the water of the Arctic lakes.

B. It pollutes the fresh air in the Arctic.

C. It takes in the sunlight and holds the Arctic ice.

D. It absorbs carbon dioxide and gives off oxygen.

【3】How does Walter Anthony feel about the gas methane?

A. It is amusing.B. It is beneficial.C. It is a blessing.D. It is a threat.

【4】Where might this text come from?

A. A science fiction.B. A tourist brochure.

C. A science report.D. A geography textbook.

Answer 1

【答案】

【1】D

【2】A

【3】D

【4】C

【解析】

本文是一篇记叙文，讲述了Katey Walter Anthony在埃塞赫湖的新发现——湖水里冒出甲烷气体，这种温室气体可能造成全球变暖。

【1】细节理解题。根据第三段中的“Then she struck a match and opened the bottle to release the gas she had just collected. The gas caught fire!”可知，她划了一根火柴，打开瓶子，放出刚刚收集的气体。气体竟然被点燃了，由此可知，埃塞赫湖令人感到奇怪的原因主要是它冒出可燃性气体，故D项正确。

【2】推理判断题。根据第四段中的“As a strong greenhouse gas, it can absorb radiation from the sun, warming the atmosphere. Methane, along with carbon dioxide, is a major source of global warming.”可知，甲烷属于强温室气体，可以吸收光的辐射，使大气层变暖，与二氧化碳共同列为全球变暖的主要来源，由此可知，埃塞赫湖冒出的气体会使北极湖泊的水变暖，故A项正确。

【3】推理判断题。根据最后一段中的“Walter Anthony has spent nearly 20 years trying to understand this threat… And to her, Lake Esieh could be a warning.”可知，Walter Anthony认为，来源于这个湖里的甲烷气体是一种威胁，故D项正确。

【4】推理判断题。通读全文可知，本文主要讲述的是Katey Walter Anthony在埃塞赫湖的新发现——湖里冒出甲烷气体，这种温室气体可能造成全球变暖，这属于科学范畴，所以这篇文章应该来自于一篇科学报告，故C项正确。