松与柠条混交种间关系的调节技术。

阅读理解。

     China is the country with the largest population in the world. Too many people cause many problems such

as food problem. And today, China's population is still growing very fast. So in order to control the population,

China has formulated the policy of family planning, that is,late marriage, late childbirth and fewer but healthier

children. Men of 22 years old and women of 20 years old can get married (结婚). If a man of 25 or over 25

gets married with a woman of 23 or over 23, their marriage is a late marriage. Children by a woman at the age

of 23 or late is a late childbirth. The country encourages people to have only one child. Family planning is a

useful policy to control China's population. And it is still needed in China in following years.

1. What is the passage about? [ ]

A. China's population problem

B. China's family planning

C. China's late marriage

D. China's childbirth

2. China has formulated the policy of family planning because ______.[ ]

A. population problem can cause many other probolems

B. China has too many people

C. China wants to control its population

D. A, B and C

3. Which of the following is a late marriage? [ ]

A. A man of 26 with a woman of 23.

B. A man of 25 with a woman of 22.

C. A man of 23 with a woman of 23.

D. A man of 23 with a woman of 20.

4. The word "encourage" in the article means ______.[ ]

A. 赞助

B. 提醒

C. 鼓励

D. 逼迫

5. Family planning is ______ in today's China. [ ]

A. not needed

B. still needed

C. not good

D. useless

旅客在乘机期间受到的人身伤害，航空公司应当负赔偿责任的有( )。

A．因为劫机事件导致旅客受伤

B．因为飞机颠簸导致旅客摔伤

C．旅客在飞行途中突发心脏病死亡

D．飞机故障导致旅客受伤

E．飞行中行李脱落砸伤旅客

用价格指数调整法估算无形资产重置成本，当生产资料价格指数与生活资料价格指数接近，且物质、人工两类费用比重差别较大时，应选择( )估算重置成本。

A．生产资料价格指数

B．生活资料价格指数

C．生产资料结合生活资料价格指数

D．比重较大费用适用价格指数

酸、碱、盐溶液能导电，是因为在水中解离出自由移动的离子．下列物质溶于水后所得溶液能导电的有（　　）

A．CO₂

B．H₂SO₄

C．Cu（OH）₂

D．BaSO₄

通道式货架有货柜式货架、托盘货架、悬臂式货架和______式货架等。