β-萘胺一般采用β-萘酚的氨解制备，该方法称为（）反应。

阅读理解.根据短文内容,选择正确答案。

     In almost every big university(大学)in the United States, football is a favorite sport. American

football is different. Players sometimes kick the ball, but they also throw the ball and run with it.

They try to take it to the other end of the field. They have four chances(机会)to move the ball

ten yards(码). They can carry it or they can throw it. If they move the ball ten yards, they can

try to move it another ten yards. If they move it to the end of the field, they receive six points(点).

     It is difficult to move the ball. Eleven men on the other team try to stop the man with the ball.

If he does not move the ball ten yards, his team kicks the ball to the other team.

Each university wants its own team to win. Many thousands of people come to watch. They all

shout for their favorite team.

     Young men and women come on the field to help the people shout more. They dance and

jump while they shout.

     Each team plays ten or eleven games each season.

     The season begins in September and ends in November. If a team is very good, it may play

another game after the season ends. The best teams play again on January 1st, the first day of the

New Year. Many people go to see these games and many others watch them on TV.

1.The passage talks about ______.

A.football                        

B.how to play football

C.American sports            

D.American football

2.We can ______ the football in both American football and Chinese football.

A.kick    

B.throw

C.run with

D.catch

3.Why is it difficult to move the ball? Because ______.

A.ten yards is a long way

B.many men on the other team try not to let the ball come near

C.the playing field is very large

D. eleven men have to catch the ball one by one

4.If they ______, the teams will play on January 1st.

A.receive six points

B.play eleven games in the season

C.are the best teams    

D.move the ball to the end of the field

5.Many people come to watch football and they want their team to win.

   Which of the following is not their act?

A.Jumping

B.Dancing

C.Crying    

D. houting

数据模型由数据结构、数据操作和 【12】 三个要素组成。

女，23岁。有习惯性流产史，均发生在孕5～6个月，目前孕4个月，昨日起有 * * 流血，查宫颈扩张约2cm，并可触及羊膜囊，胎心好，无腹痛及 * * 流血，处理应为

A．卧床休息

B．禁性生活

C．口服维生素E

D．肌注黄体酮

E．保胎+宫颈内口环扎术

2007年粮食种植面积10553万公顷，比上年增加70万公顷；棉花种植面积559万公顷，增加7万公顷；油料种植面积1094万公顷，减少60万公顷；糖料种植面积167万公顷，增加10万公顷。

全年粮食产量50150万吨，比上年增加350万吨，增产0.7%，其中，夏粮产量11534万吨，增产1.3%；早稻产量3196万吨，增产0.3%；秋粮产量35420万吨，增产0.6%。

全年棉花产量760万吨，比上年增产1.3%。油料产量2461万吨，减产42%。糖料产量11110万吨，增产11.4%。烤烟产量239万吨，减产3.9%，茶叶产量114万吨，增产10.9%。

全年肉类总产量6800万吨，比上年减少3.5%。其中，猪肉减少9.2%，牛、羊肉分别增长6.1%和5.8%。全年水产品产量4737万吨，增长3.3%。全年木材产量6974万立方米，增长5.5%。

全年新增有效灌溉面积107万公顷，新增节水灌溉面积136万公顷。

2007年下列哪种粮食作物种植面积的增加幅度最大？（）

A．棉花

B．油料

C．糖料

D．森林

任何一种生物的生存环境中都存在着很多生态因子。生态因子的数量虽然很多，但可依其性质进行归纳。( )