单项选择题

Questions 18 - 21 are based on the following dialogue between Professor Joanna and her student. What does Professor Joanna tell John about the problem

A．It will probably appear at a later time.
B．It’s acceptable to ignore it.
C．It will be very difficult to solve it.
D．It’s extremely serious.

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单项选择题

单项选择题

Questions 18 - 21 are based on the following dialogue between Professor Joanna and her student. What does Professor Joanna tell John about the problem 您的浏览器不支持 audio 元素。