第一节 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 How many students are there in the computer class

A．somber
B．novel
C．serious
D．trite(陈腐的)

A．laziness is a moral sin
B．there are advantages and disadvantages in being lazy
C．laziness is the sin off deep-seated emotional problems
D．lazy people do more careful work