计算：（16）-1-20090+|-25|-20

阅读理解。

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

     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 the other team.

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

for their favourite 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 1, the first day of the New Year.

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

1. In American football players can_____.

A. only kick the ball                

B. only throw the ball

C. only carry the ball              

D. kick, throw and carry the ball

2. Which is the best title for the passage?

A. American Football

B. Most People Like Football

C. Many People Enjoy Watching Football Games

D. American Football Is Not Like Soccer

利用如图所示装置做“验证牛顿第二定律”的实验时：

（1）甲同学根据实验数据画出的小车的加速度a和小车所受拉力F的图像为下图所示中的直线Ⅰ，乙同学画出的图像为图中的直线Ⅱ；直线Ⅰ、Ⅱ在纵轴或横轴上的截距较大，明显超出了误差范围，下面给出了关于形成这种情况的四种解释，其中可能正确的是：

A．实验前甲同学没有平衡摩擦力

B．甲同学在平衡摩擦力时，把长木板的末端抬得过高了

C．实验前乙同学没有平衡摩擦力

D．乙同学在平衡摩擦力时，把长木板的末端抬得过高了（2）在研究小车的加速度a和小车的质量M的关系时，由于没有始终满足M>>m（m为砂桶及砂的总质量）的条件，结果得到的图像应是：

（3）在研究小车的加速度a和拉力F的关系时，由于没有始终满足M>>m的关系（m为砂桶及砂的总质量）的条件，结果得到的图像应是：

颅骨骨折的直接征象是()

A．乳突气房消失

B．颅内积气

C．软组织肿胀

D．骨折线

E．蝶窦积气－液平面

急性心肌梗死的发病机制中正确的是（）

A.心肌急性严重缺血5分钟以上

B.多数由于不稳定粥样斑块溃破出血和管腔内血栓形成

C.只发生在频发心绞痛的患者

D.无心绞痛者不会发生急性心肌梗死

E.不会伴发严重心律失常

商业银行衍生产品交易业务管理中，高级管理人员应当（）。

A.了解所从事的衍生产品交易风险

B.审核批准和评估衍生产品交易业务经营及其风险管理的原则、程序、组织、权限的综合管理框架

C.通过独立的风险管理部门和完善的检查报告系统，随时获取有关衍生产品交易风险状况的信息

D.在获取有关衍生产品交易风险状况的信息的基础上，进行相应的监督与指导