单项选择题

How can I ever concentrate if you（）continually（）me with silly questions.

A．have； interrupted
B．had；interrupted
C．are；interrupting
D．were；interrupting

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单项选择题

The current rate of annual increase in the world population is about（）.

A．9 million.
B．5.7 million.
C．90 million.
D．20 million.

单项选择题

The speaker thinks that（）.

A．writing is his favourite course.
B．he prefers other courses to composition.
C．one particular course is better than writing.
D．he doesn’t like any course, least of writing.