问题 问答题 简答题

简述海岸建筑物引起的岸线变形?

答案

参考答案:

在动态平衡的海岸修建建筑物,如建造突堤、导堤、丁坝或者进行人工挖槽等,部分或全部拦截了沿岸输沙运动,破坏了自然平衡状态,就可能会引起岸线的长期变形。在沿岸输沙丰富的海岸建造单突堤或双突堤,由于阻拦了沿岸泥沙运动,造成了堤的上游侧严重淤积,下游侧海岸冲刷后退。人工挖槽(如入海航道)引起上游侧输沙向挖槽堆积,而下游侧海岸由于供沙不足而发生冲刷。

阅读理解

Do you love your family? Then May 15, the International Day of Families, was a good day to celebrate! The United Nations started this special day in 1994. it wanted people to know how important families are. If all the families on Earth could be happy, then the whole world would be a more peaceful place.

What makes a happy family? Our readers say it’s understanding!

Zhao Wei, 15, girl, Harbin Lianzhong Middle School: “My parents seldom fight with each other. I quarrel with them sometimes. They think I should not make friends with some kids who think they are bad. I think I’ve grown up and can make my own decisions. But most of the time, my parents are right. To me, family is like a soft sofa. I can be very comfortable on it!”

Wu Hao, 14, boy, Nanjing Foreign Language School: “My family is not rich. When I was a small child, other kids had a lot of good stuff (东西) but I didn’t. I asked my parents why. They told me that we didn’t have much money. I began to understand my parents then. I will do part-time jobs when I enter college. That way my parents won’t have to work so hard. Family is like a nest. It’s warm and safe.”

Zhang Xun, 15, boy, Hefei No 45 Middle School: “I’m a naughty boy who doesn’t study very hard. My parents always talk to me about this and they get very angry sometimes. I hope they won’t get angry when they talk to me. And I should behave well and be a good boy. My family is like my basketball. I love playing basketball. It makes me happy.”

46. People have celebrated the International Day for _________ years.

A. more than 19   B. about 15   C. less than 15    D. just 8

47. The United Nations started the International Day mainly _______.

A. to amuse people               B. to get people to know families are important

C. to make people a peaceful world  D. to make people who have families happy

48. Zhao Wei sometimes quarrels with her parents because _______.

A. she has grown up                B. she enjoys making friends with kids

C. they stop her from making friends   D. her parents are always right

49. Wu Hao will _________ when he enters college.

A. do part-time jobs to make his parents relaxed

B. make his family warm and safe

C. work to buy a lot of good stuff

D. do part-time jobs to get some money

50. Zhang Xun _______.

A. likes his family very much

B. likes his family if his parents let him play basketball

C. hates his family because his parents don’t like him

D. hates his family because his parents always get angry with him

单项选择题