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1、武威六中2018-2019学年度第二学期高一英语第三次学段考试试卷第一部分 阅读理解（共三节，满分70分）第1节 (共15小题；每小题2分，满分30分)阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项，并在答题卡上将该项涂黑。AAnimal moms are great moms. You might be surprised at some of these moms.Octopuses (章鱼)The mother octopus lays about 50,000 eggs. For about 300 days, she stays with the eggs, c
2、leans them and protects them. She does not leave to feed. However, this animal mom dies as soon as the eggs are hatched (孵化). CrocodilesA crocodile mother puts a lot of time and effort into raising her babies. She starts by building a nest (巢), which she guards for over two months! When the eggs are
3、 ready to hatch, the young crocs call out to their mother, who digs them out and helps them hatch. She then carries them in her mouth down to the water, where she will guard them for several more weeks or months until they learn to hunt on their own.Bats Bats become moms by hanging head up in a cave
4、, giving birth. Catching the youngster before it can fall to the ground below, she puts it in a pouch (育儿袋). Bat moms may carry babies with them when feeding for the first few days. As the little bats get bigger and heavier, moms help them hang on the wall of their caves and return often to feed the
5、m. It continues for about three weeks, until the babies are grown up and able to fly on their own.Koalas (考拉)The animal mom gives birth after a pregnancy (怀孕期) of only 35 days. The hairless baby climbs into its mothers pouch and lives there for another five months. When the little koala is between f
6、ive and eight months old, it leaves the pouch for short periods of time but returns for safety. Once it is too big to return to the pouch, it will climb onto its mothers back and ride there until it is about 12 months old.1 Which animal moms die when their babies are born?A. Octopuses.B. Crocodiles.
7、 C. Bats. D. Koalas.2. A crocodile mother usually carries her baby to the water _.A. in her mouth B. on her back C. in her pouch D. by her tail3. A bat mom _. A. gives birth by lying in the nest B. gives birth by hanging in a cave C. leaves its babies in the pouch for months D. lets its babies live
8、on their own after birthBIts a sure sign that summer is over and winter is on the way leaves that were once deep green turn red, yellow and bright orange. It happens every autumn. But did you ever wonder why?The leaves start changing color when the nights start getting longer and the temperature sta
9、rts getting cooler. Some scientists think that as the number of daylight hours shrinks, the leaves stop making chlorophyll（叶绿素）which makes plants green. The reason is that the process of making chlorophyll requires sunlight. But according to horticulture (园艺) educator Susan Rose from Colorado State
10、University, it turns out leaves dont really change color at all. “The fall colors are actually there all along,” she said. “But they are covered by the green chlorophyll. As the chlorophyll stops being produced, the other colors can shine through.” The kind of color that the leaves are going to chan
11、ge to is determined by the plants genetic (基因的) background. In some places, the leaves start changing color in September before autumn even officially begins. In other places, they dont change until late October or even November. Some scientists say the leaves have been changing color later than usu
12、al in recent years. And they think global warming has something to do with that. In one study, researchers found that the growing season in the Northern Hemisphere was nearly a week longer, on average, in 2008 than it was in 1982. And a professor from Harvard University found that the leaves, west o
13、f Boston, Massachusetts, are changing color about three days later than they used to. However, other scientists disagree with the global warming theory. Susan Rose said the leaves in her part of Colorado are changing “right on schedule.” But the leaves in other parts of that state are running a litt
14、le late. “The lateness in the mountains may have something to do with the really warm late summer and early fall,” she said. “But Im afraid thats just a guess.”4. According to Susan Rose, _.A. the fall colors are always in leaves B. leaves make chlorophyll all the seasonsC. leaves changing color hav
15、e nothing to with the weatherD. leaves begin changing color because they start making chlorophyll5 The underlined word “shrinks” in Paragraph 2 could best be replaced by _.A. reduces B. increases C. lasts D. appears6 Scientists guess leaves change color later than usual probably as a result of _.A.
16、genetic background B. dry weather C. global warming D. low temperature7. The purpose of the last paragraph is to tell readers _.A. why leaves change color at fall B. leaves change color at different timeC. the effects of the global warming on plantsD. different opinions on the lateness of leaves changing
