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问题 选择题
关于透镜，下列说法中不正确的是（　　）

A．凸透镜和凹透镜都有焦点，凸透镜有实焦点，凹透镜有虚焦点

B．凹透镜对光线有发散作用，但通过凹透镜的光线也可能会聚在一点

C．凸透镜对光线有会聚作用，因此通过凸透镜的光线都一定会聚在一点

D．平行于主光轴的光线，通过凸透镜后一定经过焦点

答案

答案：C

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      Here is Richard's school report card.
SubjectCommentsScores
EnglishIt is good to teach Richard. He
always writes well and his spelling
is good. He did well in this year's
exam.		95
MathsRichard thinks maths is difficult
but he always tries hard and sometimes
he surprises me.		62
scienceRichard showed a good understanding
of science but his exam result was not
very good because of his carelessness.		52
History An excellent student.It is always a pleasure
to read his work.		87
MusicHe always tries hard and shows a good
understanding of the subject. 		80
P.E.Richard plays football well but he is not
good at other sports. 		No exam
1. From the scores Richard is best at ______.
[ ]
A. English
B. Maths
C. Music
D. History
2. ______ teacher thinks Richard is an excellent student.
[ ]
A. Music
B. Maths
C. P.E
D. History
3. Richard didn't do well in his Science exam because ______.
[ ]
A. he is not good at Science
B. he was careless in the exam
C. he didn't take the exam
D. the exam was very difficult for him
4. How about Richard's P.E.?
[ ]
A. He scored 80 in the P.E. exam.
B. He is good at all kinds of sports.
C. He is good at football and there is no P.E. exam this term.
D. He doesn't like sports and he didn't take the P.E. exam.
5. What does "sometimes he surprises me" mean?
[ ]
A. It means sometimes Richard does a good job in Maths.
B. It means sometimes Richard doesn't do well in Maths.
C. It means sometimes Richard does something bad.
D. It means sometimes Richard doesn't like his Maths teacher.
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判断题

盘点实物时，发现其账面数大于实存数，即为盘盈。( )
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