单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Pollution problem.
B．Population problem.
C．Unemployment problem.
D．Nuclear weapon problem.
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单项选择题
A．They don’t enjoy swimming.B．They won’t go swimming in the lake today.C．They don’t know how to swim.D．They’ll swim in the lake tomorrow.
A．They don’t enjoy swimming.
B．They won’t go swimming in the lake today.
C．They don’t know how to swim.
D．They’ll swim in the lake tomorrow.
单项选择题
______ wants to develop the Healtheon WebMD to save hundreds of billions of dollars.
A．Bill Gates
B．Charles Schwab
C．Michael Dertouzos
D．Jim Clark
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