题目

航空母舰上一般有帮助舰载机起飞的弹射系统，已知舰载机在跑道上加速时的加速度为4.5 m/s2,若该飞机滑行100 m时速度达到50 m/s而起飞，则弹射系统使飞机具有的初速度为  (     )                                                               A.40 m/s          B.30 m/s              C.20 m/s           D.10 m/sVISIT FOREST ZOOCome and see the Indian elephants and the new tigers form Northeast of China. The beautiful birds from England are ready to sing songs for you, and the monkeys from Mount Emei will be happy to talk to you. The lovely dogs from Australia want to laugh at you. Sichuan pandas will play balls for you. The giraffes from Africa are waiting to look down on you. Keep the zoo clean. Do not touch, feed or go near to the animals.1.How many kinds of animals are mentioned(提及) in the passage?A. Three. B. Four. C. Five. D. Seven.2. Where are the pandas from?A. India. B. China.C. Africa. D. Australia.3.From the passage we can infer(推断) that a giraffe _____.A. isn’t polite and friendlyB. like to stand on a high placeC. has a long neck(颈、脖子)D. looks at us proudly4. What can we do in the zoo?A. To watch the animals do all kinds of things.B. To give the animals something to eat.C. To touch the animals you like.D. To go near to the animals.5. What kind of things can the birds do from the passage?A. Talk to you. B. Sing songs.C. Laugh at you. D. Play balls.