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1、【生态环保、自然灾害类】话题阅读练习（四）（阅读理解9篇+语法填空3篇）Passage 1 In general, the riches of the natural world arent spread evenly across the globe. Places like the Tropical. Andes in South America are simply packed with unique species, many of which cant be found in any other places. Until recently, the main explanatio
2、n for the biological riches concentrated in places like the Amazon Basin was that such places must be engines of biodiversity, with new species evolving at a faster rate than other parts of the world. But now, new research on bird evolution may turn that assumption on its head, instead supporting th
3、e idea that areas with fewer species actually tend to produce new species faster. The researchers say these biodiversity cold spots are generally found in environments featuring freezing, dry and unstable conditions. Though the researchers found these locations with few bird species tend to produce
4、new ones at high rates, they fail to accumulate many species because the unstable conditions frequently make the new life forms die out. The more well-known hot spots, by contrast, have accumulated their large numbers of species by being warm, hospitable and relatively stable. Indeed, the researcher
5、s found that the countless bird species that call the Amazon home tend to be older in evolutionary terms. New species do form in places like the Amazon, just not as frequently as in the dry grasslands in the Andes , says Elizabeth, an evolutionary biologist. The researchers managed to collect 1,940
6、samples representing 1,287 of the 1,306 bird species from South America. Their analysis showed that the best predictor of whether an area would produce new species at a high rate was how many species lived there, rather than climate or geographic features like mountains. Species-rich areas tended to
7、 produce new species more slowly. Maybe bad environments generate new species more frequently because theres less competition and more available opportunities for new species, says Gustavo Bravo, a lead researcher. The studys findings add new urgency to protect ecosystems that may look barren, but m
8、ay actually be natures hothouses for the evolution of new species.1. Why is South America mentioned in the first paragraph?A. To make a comparison.B. To introduce the topic.C. To explain a fact.D. To draw a conclusion.2. What determines the rising rate of new species in place?A. The number of its th
9、en species.B. The environment they lived in.C. The survival skills of species.D. The different biological factors.3. Which of the following can best explain the underlined word barren in the last paragraph?A. Dry and bare.B. Lively and active.C. Nice and green.D. Complex and unpredictable.passage 2
10、A kind man, Keith Walker, who was 53 years old, kept his own pitbull called Bravo at the W-Underdogs (an animal shelter) overnight and was on his way to pick him up when he saw the flames on December 18. He didnt just rescue his own pet, but he made sure that all the animals were safe. He said, I wa
11、s nervous at first and really scared to go there with all that smoke. I am not going to lie. However, Keith suddenly remembered that his father once said humans had a duty Til protect animals. So he said, My dog is my best friend, and I wouldnt be here without him, so I knew I had to save all those
12、other dogs. The founder of the shelter Grace Hamlin said that the shelter was left uninhabitable by the fire, which was electrical. But luckily, they were about to move into a new place, so there was still somewhere for the animals to live. She said, Keith is my guardian. Even the firefighters didnt
13、 know how to handle the animals. They called Animal Control, but Keith was already in the building pulling out the cats and dogs until they were all safe. Keith, who has been homeless since he was 13, has now been regarded as a hero after saving the six dogs andten cats. Well-wishers have raised alm
14、ost $ 40,000 for him on GoFundMe, a fundraising platform. In a separate fundraiser for the shelter itself to rebuild after the fire, Grace said, Keith worked tirelessly to bring our animals to safety. Although he refused all offers of help, we are determined to contact him again. He is a vital part
15、of our community and he should be appropriately rewarded for his selfless efforts. 1. What did Keith do at the first sight of the fire?A. He waited for help.B. He turned to his father.C. He protected his own pets.D. He hesitated for a moment.2. What damage did the fire bring about?A. Some firefighte
16、rs were badly injured.B. The animals lost their shelter.C. Some cats disappeared.D. Keith lost his pitbull.3. Why is Grace going to contact Keith again?A. To reward him for what he did.B. To raise money for him.C. To offer him a good job.D. To rebuild a home for him.4. Which of the following can best describe Keith? A. Ambitious and helpful.
