采用热浸法测定水溶性浸出物的药材为 A．地龙 B．全蝎 C．水蛭 D．土鳖虫 E．金

A bus stops at a small bus stop. A man is hungry and he wants to buy some cakes. It’s raining(下雨) hard, he doesn’t want to go out in the rain. He sees a boy. “Come here, boy!” he cries. “Do you know how much the cakes are?” The boy says yes. The man gives the boy four dollars(美元) and asks him to buy two cakes. “One is for you and one is for me.” Three minutes later, the boy comes back. He’s eating a cake. He gives the man two dollars and says: “Sorry, there is only one cake left.”

小题1:Where is the man?

A．He’s near the bus.

B．He is at home.

C．He’s in the bus.

D．He is in the car.小题2:The man doesn’t want to go out because__________.

A．he is tired

B．he doesn’t like rain

C．he is hungry

D．it’s raining hard小题3:How many cakes does the boy get?

A．One

B．Two

C．Three

D．Four小题4:How much are they if we buy five cakes?

A．five dollars

B．Four dollars

C．Ten dollars

D．Fifteen dollars小题5:What’s the result (结果)?

A．The man eats the cake.

B．The boy eats the cake.

C．The boy doesn’t eat the cake.

D．The boy and the man both eat the cakes.

化学实验是科学探究的重要途徑。请根据下列实验图示回答相关问题：

（1）A实验中，烧杯③的作用是                    。

（2）B实验中，硬质玻璃管中的现象是                           ；装置末端酒精灯的作用是                                               。

（3）C实验中，若要除去粗盐中难溶性的杂质，其正确操作步骤为          （填序号），步骤⑤中玻璃棒的作用是                                    ；若按照②③①的步骤配制50 gl6%的氯化钠溶液，所配制溶液的溶质质量分数           （填“偏小”或“偏大”）。

一个物体在水平方向上的两个大小相等方向相反的恒力作用下，在光滑的水平面上做匀速直线运动，若撤去其中的一个力，则： [ ]

A．物体的动能可能减少

B．物体的动能可能不变

C．物体可能作曲线运动

D．若物体作曲线运动，其动能一定增加

下面有关计算机病毒的叙述中，正确的是( )。

A．防病毒软件要经常更新其病毒搜索引擎程序和病毒代码库

B．PC机只要安装了某种优秀的病毒防火墙软件，就不可能被病毒所感染

C．病毒只会感染一些可执行程序，不会感染、破坏数据文件

D．只要用户不收发电子邮件，PC机就不会被病毒通过网络感染

跟单中的“单”指的是出口货运单证。( )