问题 选择题
如图所示的LC振荡电路,在某时刻的磁场方向如图所示,则下列判断不正确的是(   )

A.若磁场正在增强,则电场能正在减少,电容器上极板带正电

B.若磁场正在减弱,则电场能正在增强,电容器上极板带正电

C.振荡电流的变化周期为:

D.电场能量的变化周期为:π

答案

答案:A

问答题
阅读理解

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