题目内容

【题目】美国国家科学院预言:在2014年的某一天,美国北部的一些城市,在五彩斑斓的极光光幕过后,电网会突然变得闪烁不定,灯光在瞬时明亮后将会停电,一分半钟之后,这个大停电现象将会遍及美国整个东部地区,甚至整个欧洲以及中国、日本等区域也会同样经历这样的灾难,而这场灾难仅仅源于太阳打了一个强烈的“喷嚏”。据此回答下列小题。

1材料中所述的太阳打了强烈的“喷嚏”极有可能是( )

A. 太阳耀斑爆发 B. 紫外线辐射增强 C. 太阳辐射增强 D. 太阳辐射减弱

2该“喷嚏”还可能产生的明显影响不包括( )

A. 无线电短波通讯中断 B. 信鸽丢失 C. 指南针失灵 D. 地球公转速度变快

【答案】

1A

2D

【解析】

1 根据题干中给出的材料“看到极光” “电网会突然变得闪烁不定,灯光在瞬时明亮后将会停电”等这些现象,是由于太阳的一个 “喷嚏”产生的,根据太阳辐射和太阳活动的有关知识可以判断,该“喷嚏”应当是一次太阳活动,四个选项中,只有太阳耀斑爆发才符合题意,故答案选A;太阳爆炸、太阳辐射增强、太阳辐射减弱等现象都不属于太阳活动现象,故都不符合题意,BCD错误。故答案选A。

2 太阳发生耀斑,会产生强烈的高能带电粒子,这些高能带电粒子闯入地球,会干扰地球高空的电离层,影响无线电短波通讯;闯入地磁场,产生磁暴,信鸽会迷失方向,指南针会失灵;故ABC都与太阳活动有关,而地球公转速度的快慢与地球和太阳的距离有关,而与太阳活动无关,故D正确。

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【题目】Good news for giant panda lovers: The cute and cuddly creature has just been brought back from the brink of extinction. The International Union for Conservation of Nature (IUCN) downgraded the species from “endangered” to vulnerable as the union released its updated Red List on Sept 4 at Hawaii.

The downgrade came after IUCN data suggested that there were 1,864 giant pandas in the wild in China in 2014 their population has grown by 17 percent in the decade leading up to 2014.

Chinese conservation efforts, including forest protection and reforestation, are considered to be the driving force behind the animal’s resurgence.

“It’s all about restoring the habitats,” Craig Hilton-Taylor, head of the IUCN Red List, told the BBC.

The number of panda reserves in China has also jumped to 67, from 13 in 1992. Nearly two-thirds of all wild pandas live in these reserves, according to the World Wildlife Fund.

“Just by restoring the panda’s habitat, that’s given them back their space and made food available to them,” Hilton-Taylor said.

A loss of habitats, on the contrary, was what caused the number of pandas to drop to just over 1,200 in the 1980s, Hilton-Taylor added.

Apart from giant pandas, the Tibetan Antelope has also moved from “endangered” to “near threatened”. According to a statement from IUCN, the animal’s numbers dwindled severely dropping from around 1 million to an estimated 65,000-72,500 in the 1980s and early 1990s due to commercial poaching. Rigorous(严格的) protection has since been enforced to protect the beasts and the population is now likely to be between 100,000 and 150,000.

Despite the improved statuses, wild animals like the giant panda and the Tibetan Antelope still face great challenges. The IUCN warned, for example, that ongoing threats from climate change could eliminate more than 35 percent of the panda’s bamboo habitat in the next 80 years, which would reverse the species recent gains.

【1】What does the underlined word “vulnerable” in paragraph 1 mean?

A. dangerous and threatened.B. safe and sound.

C. weak and easily hurt.D. normal and common.

【2】Which of the following can account for pandas’ living improvement?

A. Better climate.B. More built reserves.

C. Well restored habitats.D. Aroused public awareness.

【3】The passage is written in order to ________.

A. convinceB. informC. argueD advocate

【4】What does the last paragraph imply?

A. The climate will influence the threatened species.

B. Habitats for giant pandas will decrease sharply.

C. Pandas will go extinct for lack of abundant food.

D. We humans still have a long way to go to protect the endangered species.

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