问题 选择题

如图表示两类动物的耗氧量与环境温度的关系,下列叙述中正确的是(  )

A.乙是变温动物,甲是恒温动物

B.乙是恒温动物,甲是变温动物

C.甲、乙都是变温动物

D.无法判断

答案

呼吸作用是生物的基本特征,进行的场所是线粒体,其表达式为:有机物+氧→二氧化碳+水+能量,在此过程中释放出大量的能量,一方面满足自身的需要,另一部分以热能的形式散失出去.由图可以看出:对于甲由于外界温度升高,因此身体散失的热量就减少,所以可以适当的降低呼吸强度,少产生些热量,当温度达到一定程度时,身体自身的调节功能使其维持在一定的程度,而乙呼吸强度随温度升高而不断升高,可见乙并没有调节功能,只是由于呼吸酶的活性随着温度升高而升高导致呼吸加强,判断出甲是恒温动物,乙是变温动物.

故选:A

阅读理解

Many children love to play with snow in winter. But Long Chuan has come to hate it.

This year his hometown suffered from snowstorms (遭受暴风雪) for nearly a month. The heavy snow stopped cars and trains, broke the electricity (电) tower and turned tap water to ice.

Every day Long Chuan had to walk several kilometers to carry drinking water. “I couldn’t ride a bike and it took me 3 hours to walk to school. I can’t remember how many times I slipped (滑倒) on the hard ice, ” said Long Chuan.

Long is not alone. This year millions of people in central and southern China had a freezing winter without enough water and electricity. The biggest snowstorms in 50 years killed more than 100 people. They also cost the country 111.1 billion yuan.

Experts (专家) say a special type of climate condition (气候条件), La Nina, caused the storms. During a La Nina, the water in the Pacific Ocean (太平洋) near the equator (赤道) becomes colder than usual. It changes the weather around the world.

Besides China, Canada, the US and Middle Eastern countries also met with heavy snowstorms this winter. The special climate caused the recent flooding (洪水) in Australia, too.

However, experts say that people have destroyed the environment (环境). Global warming (全球变暖) may be causing these terrible weather events to happen more and more often.

小题1:What took place in Long Chuan’s hometown last winter?

A.Earthquake.

B.Flooding.

C.Traffic Accident.

D.Heavy snowstorms.小题2:During the snowstorms this year, Long Chuan  __________.

A.had to walk to carry drinking water

B.had to ride a bike to school

C.couldn’t go to school on foot

D.couldn’t play with snow小题3:The heavy snow ____________ this year.

A.killed millions of Chinese

B.cost China 111.1 billion yuan

C.used too much electricity

D.lasted more than three hours小题4:We can tell from the story that __________ .

A.China is the only country which suffered from the heavy snow

B.La Nina is said to have caused the snowstorms

C.La Nina also caused hot summer in Australia

D.the snowstorms have nothing to do with global warming小题5:The passage tells people around the world ___________.

A.to wear more clothes in winter

B.to stop riding bikes on the hard ice

C.to protect (保护) the environment

D.to save water and electricity

单项选择题 A1/A2型题