Unit 13预习课 2023-2024学年人教版九年级英语全册

Unit 13 We’re trying to save the earth!检测题 1． 完型 Scientists predict(预测）that most polar bears(北极熊）will disappear by the year 2100 because of global warming(全球变暖）。 Even if it is slowed, the loss of ice means most polar bears will still be seriously influenced. Scientists believe there are about 25, 000 polar bears left. Polar bears spend most of their lives on the ice which 1______the Arctic(北极的）seas. As the world gets hotter, the Arctic is warming about twice as quickly as other places. This is making the ice cap 2______and thinner. Scientists say that by 2040, the ice could melt（融化）completely during the summers. For polar bears, that's a matter of life and death. Polar bears 3_____ the sea ice to travel, find mates(配偶），and hunt. In winter, when there's ice, polar bears eat as much as possible to store up energy. But these days,there's less winter ice, meaning the bears have fewer areas for 4_______. Summers are the hardest time. With less ice to travel on, they're 5_______ to spend more time on land, where there isn't much food.Polar bears can go as long as six months without food. But rising temperatures are causing ice-free times to come 6_____ and last longer. That means the bears need to go without food for longer. The lack of food may 7_____baby polar bears the hardest. If they can't live through the summers, polar bear numbers are likely to drop quickly. Scientists 8______that if global warming continues, it's possible that only the polar bears in the coldest parts of the Arctic would survive. To help save polar bears, rapid action is needed. Though that may not seem likely, it is still 9_____. As researcher Peter Molnar says,＂There is hope that they won't completely disappear,if we change our 10______.” 1. A.meets B. makes C.covers D. protects 2. A. rounder B. older C.longer D. smaller 3. A.depend on B.find out C.wait for D.deal with 4. A. sleeping B.p