甲、乙两人进行百米赛跑,甲比乙提前10m到达终点.若两人速度保持不变,甲退到起跑

题型:选择题

问题:

甲、乙两人进行百米赛跑,甲比乙提前10m到达终点.若两人速度保持不变,甲退到起跑线后10m开始与乙再比赛(乙仍从起跑线开始跑),那么这次比赛谁先到达终点(  )

A.甲、乙同时到达终点

B.甲、乙谁先到达终点难以判断

C.甲先到达终点

D.乙先到达终点

考点:速度的计算比较快慢的方法
题型:选择题

任务型阅读。仔细阅读下面的短文并按要求完成后面的小题。

     It is said that about half of the people in China smoke. Many young boys and girls have the habit of

smoking, though they are middle school students.

     More and more people have come to realize how serious this problem is. But they are never bored

with it. (1) Some people think it is a kind of fashion, some think it is of great fun and others think that

smoking can refresh themselves.

     Smoking causes many illnesses. A lot of people always cough (2) ______ ______ smoking. The most

serious illness caused by smoking is lung cancer. At the same time smoking is a waste of money. Besides,

careless smokers may cause dangerous fire. 

     (3) 众所周知,吸烟有害于人体健康。In order to keep healthy, we should get rid of the bad habit

of smoking. Please stop smoking at once.

1. 将(1)句划线部分译成汉语:___________________________________________________________

2. 在(2)句的空白处填入适当的词使句意完整、上下文通顺:______ ______ 

3. 将(3)句划线部分的汉语译成英语:_____________________________________________________

4. 列出短文中提到的吸烟的至少两点危害:________________________________________________

5. 该篇短文的主题是:__________________________________________________________________

题型:选择题

物体A、B的s-t图象如图所示,由图可知(  )

A.从第3s起,两物体运动方向相同,且vA>vB

B.两物体由同一位置开始运动,但物体A比B迟3s才开始运动

C.在5s内物体的位移相同,5s末A、B相遇

D.5s内A、B的平均速度相等

题型:选择题

将某盐酸与氢氧化钠溶液混合后,向其中滴加紫色石蕊试液,溶液变红,下列说法不正确的是[ ]

A.混合后溶液的pH<7

B.混合后溶液为氯化钠溶液

C.混合后溶液的质量是混合前两种溶液的质量之和

D.混合后溶液中水的质量大于混合前两种溶液中水的质量之和

题型:选择题

长期控制体重者运动锻炼应该限制饮水

题型:选择题

静态NAT是设置起来最为简单和最容易实现的一种,其作用是 (8) ;动态地址NAT的作用是 (9) ;NAPT的作用是 (10) 。本端路由器对企业部网络的Web服务器以及OA服务器采用的就是 (11) ;而终端用户访问Internet采用的是 (12)

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