我国作为一个发展中国家，多年来在致力于自身发展的同时，始终坚持不附带任何政治条件，向

密闭和临时栅栏附近（）米内，严禁存放物料和设备。

A、8m

B、2m

C、5m

在磁感应强度为，竖直向上的匀强磁场中，放置一根长通电直导线，电流的方向垂直纸面向外，如图所示，a、b、c、d是以直导线为圆心的同一圆周上的四点，在这四点中[    ]

A．c、d两点的磁感应强度大小相等

B．a、b两点的磁感应强度大小相等

C．a点的磁感应强度的值最小

D．b点的磁感应强度的值最大

Mr. Green and Mr. King have taught English at Beijing Sunshine

Secondary School _____ they came to China two years ago.[ ]

A. since

B. as

C. for

D. until

太阳能热水器是利用太阳能来加热水的一种装置。有一太阳能热水器安装在离地面10  m 高的屋顶上，现需要将100 kg 初温为10 ℃的水加热到60 ℃，则[g=10 N/kg ， c _水=  4.2 ×10³ J/(kg ·℃)]  

(1) 把这些水送到屋顶的热水器中，需要对水做多少功？  

(2) 这些水从太阳那里吸收多少热量？ 

(3) 下雨时，改用热水器中的电辅助加热( 加热功率P=1 500 W) ，若不计热损失，将这些水加热至相同温度要多长时间？约用多少千瓦时的电能？

Do you like chocolate? Maybe most people do. A box of it can be a great gift. Buy one for a friend and give it as a surprise. See how happy that person gets.

Say you just got a box of chocolate. Which piece do you pick first? A man has studied people’s choices. He says they tell something about the person. Did you choose a round piece? You are a person who likes to party. Did you choose an oval (椭圆形的) shape? You are a person who likes to make things. Picking a square shape shows something else. The person is honest and truthful. You can depend on him or her.

What kind of chocolate do you pick? Maybe you like milk chocolate. This shows you have warm feelings about the past. Dark chocolate means something else. A person who chooses it looks toward the future. What about white chocolate? Would you choose it? If so, you may find it hard to make up your mind. Some people like chocolate with nuts (果仁). These are people who like to help others.

Do you believe these ideas? Can candy tell all these things? It doesn’t really matter. There is one sure thing about eaters of chocolate. They eat it because they like it.

小题1:This passage mainly tells us ______.

A．why people like chocolate

B．almost everyone likes chocolate

C．about different kinds of chocolate

D．different choices may show different characters小题2:Picking a round shape of chocolate shows that a person ______.

A．likes singing, dancing and drinking

B．likes to do something for others

C．is good at making things

D．can be depended on小题3:If you enjoy eating milk chocolate you may ______.

A．look forward to the future

B．like to think of the past

C．enjoy parties and fun

D．have trouble making decisions小题4:From this passage we can say that a helpful man may choose chocolate ______.

A．in oval shape

B．in square shape

C．with nuts

D．with coffee小题5:The last paragraph suggests that the writer ______.

A．believes all the information about chocolate

B．does not believe the information about candy

C．is trying to get you to believe false information

D．doesn’t think it important whether you believe the ideas