1. (2023高一下·哈尔滨月考) 阅读下列短文，在ABCD 中选出最佳答案阅读下列短文，在ABCD 中选出最佳答案

The masked shrew is one of the smallest mammals(哺乳动物) in North America, only a few inches long. However, it recently made a giant jump. Over the past few decades, the tiny shrew has migrated more than 4,000 feet on both sides of the Rocky Mountains. And it's not the only one.

Studies in other parts of the world have suggested that mountain animals are climbing higher.

Lead study author Christy McCain, an ecologist at the University of Colorado Boulder, and her co-authors Sarah King and Tim Szewezyk wanted to show it is true in the Rockies.

The new study looked at 47 different species of small mammals in the Colorado Rocky Mountains. First, the researchers studied the small mammal samples (样本) collected in Colorado over the last few decades and built a database on where these mammals were typically found and how high up. Next, they conducted a series of field surveys in the Colorado Rockies, counting small mammals and recording where each species is found today. They then calculated how much each mammal population has moved over the last few decades.

They found that 26 of the 47 species studied had moved upward over time. Masked shrews were among the species with the largest jumps, climbing a total of about 4,500 feet. McCain noted that species with the largest upward jumps tend to share some important characteristics. Most of them are animals specifically adapted to cold weather. 11 of the 47 mammal species actually shifted downward. McCain noted they may be less sensitive to mountain warming. Six species do not appear to have changed at all. And four species have completely disappeared from the mountains in the period between the 1980s and now.

"This is the first indication," McCain said, "that large animal communities are responding to climate change. " The findings are consistent with the conclusions of other studies around the world — that mountain ecosystems are sensitive to climate change and wildlife in these places is already responding to the pressure, both of which can urge humans to change the current situation.

1. （1） Why did Christy McCain and her team do the study?

   A . To collect data of mountain animals. B . To urge humans to change the situation. C . To prove the previous conclusions. D . To assess the effects of climate change.
3. （2） What does the study find about mountain mammals?

   A . Many species have disappeared. B . None have shifted downward. C . Those going higher are sensitive to cold. D . Many are affected by climate change.
5. （3） What can the findings function as?

   A . A wake-up call. B . A climate reminder. C . A pressure response. D . A situation changer.
7. （4） What's the main theme of the text?

   A . Mountain mammals climb higher to beat the heat. B . Cold-adapted species suffer a lot in the Rockies. C . Climate change is making the Rockies unlivable. D . Small mammals are vital to mountain ecosystems.