单项选择题

At 13 he was sent to a shop, () he learned the business.

A．when
B．which
C．where
D．that

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单项选择题

It can be inferred from the last paragraph that ().

A．your computer will always keep safe the important information
B．computer problems are easy to deal with
C．you will have to replace your computer system sooner or later
D．you must change your system regularly

单项选择题

This passage talks mainly about ().

A．when and how the umbrella was invented
B．why the umbrella was so popular in Europe
C．the development of the umbrella
D．the history and use of the umbrella