Unit 2Working the landSection Grammar动词ing形式作主语和宾语.单句语法填空1We visited other relatives the next day, who had prepared a lot of delicious food. At night, we all went to KTV and had a great time singing (sing) together.2Remembering (remember) some new words every day can enlarge your vocabulary.3Its no use persuading (persuade) him any more.He wont change his mind.4My daughter is practising playing (play) the violin in her room now.5Attending (attend) the party last night made Alice very excited.6Its no use asking (ask) him for help，for he is very selfish.7Marys being (be) late for class this morning made the teacher angry.8The two students who had broken the school rules were lucky enough to escape being_punished (punish)9It is a waste of time trying (try) to persuade him to give up playing computer games.10When Jane saw me，she stopped talking (talk) with our classmate Linda and smiled to me by the roadside.阅读理解 Narwhals are midsized whales living in the cold waters of the Arctic Circle near northern Canada and Greenland. They grow between 4 and 6 m in lengtha similar size to the beluga whale. But it is not difficult to tell narwhals from beluga whales. Male (雄性的) narwhals have a great spiraled (螺旋形的) tooth that comes out from their heads, making them different from beluga whales. The long tooth can reach up to 3 m in length and grows continually to replace wear (磨损). Researchers are unsure of the right purpose of the tooth. Some believe it is used to attract a mate, while others believe it is used to fight. One researcher believes that the tooth has the ability to notice changes in water temperature. Narwhals also differ from belugas in skin color. Adult belugas are white, while narwhals have black and white mottled (杂色的) skin. Like many other whales, narwhals travel in groups. Their groups have 1520 whales. Sometimes several small groups will meet in groups of up to 100 whales, although it is hard to get the right numbers. Narwhals have proven difficult for researchers to track, mainly due to the cold and icy water conditions and the fact that narwhals do not come very close to shore. Searching for food mainly on the bottom of the sea, narwhals dive on average 800 m, but can go twice that deep. The dives last around 25 minutes. In the summer, narwhals dont feed very often, having stored up enough energy during the winter feeding season. They return to the same feeding grounds each year.【文章大意】本文是说明文。文章主要介绍了独角鲸。1Whats the main difference between narwhals and beluga whales?ATheir size.BTheir eating habits.CTheir tooth and skinDTheir living conditions.解析：C细节理解题。根据第二段中的Male narwhals have a great spiraled tooth that comes out from their heads, making them different from beluga whales和Narwhals also differ from belugas in skin color可知，独角鲸与白鲸的区别在于它们的牙和皮肤。2What is one reason why it is hard for researchers to track narwhals?AThey swim very fast.BThey are small in number.CThey are fearful of humankind.DThey stay away from the shore.解析：D细节理解题。根据第三段中的mainly due to the cold and icy water conditions and the fact that narwhals do not come very close to shore可知，独角鲸不会游到岸边，所以研究人员很难追踪到它们。3What can we infer from the text about narwhals?AThey live at the bottom of the sea.BThey suffer a lot from icy water.CThey stop eating in summer.DTheyre social animals.解析：D推理判断题。根据第三段中的Like many other whales, narwhals travel in groups可知，独角鲸是群居动物。4Whats the purpose of the text?ATo introduce a sea animal.BTo compare two kinds of whales.CTo call on readers to protect the sea.DTo inform readers of the whale family.解析：A写作目的题。本文从独角鲸的外表、生活习性等方面向读者介绍了这种生活在北极冰冷海域的鲸。.完形填空Chuck is not an ordinary frog. For one thing, his name is Chuck. What a strange _1_ it is for a frog! For another, he loves _2_ flies, but he _3_ catches flies himself. Some frogs think Chuck is really _4_. However, that doesnt matter to Chuck. Each morning, Chuck sits and _5_ under a spider web near a pond. Then when the spider goes off to wash her feet in the pond, Chuck catches flies from her _6_. One morning, while Chuck was _7_ his breakfast, the spider _8_ and saw him. “Youre the one who _9_ eating my flies! Go and catch your own！” she cried. Chuck _10_ jumped into the pond. Suddenly, Chuck got an idea! “Why not make my own web？” he thought. Chuck worked on his web for hours _11_ stars appeared in the sky. And then he _12_. When he woke up the next morning, he found he was _13_ inside. “Help！” he shouted. Finally, with the help of the spider, Chuck was _14_ and fell down onto the ground.“No matter how hard I try, I cant make a spider web，” Chuck said. “Making a spider web is not as _15_ as you think，” the spider said.“But you can swim. I always see you in the _16_.How wonderful it would be to _17_ in the middle of the pond in the sun！” From that day forward, Chuck