单项选择题

The most serious problem man is facing is thought to be （）

A．the using of the earth’s resources
B．the control over the waste of the natural materials
C．how to slow down the increase of population
D．how to stop the birth of new babies

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单项选择题

People are always curious because （）

A．they know nothing about the world
B．they know little about the world
C．there are answers they do not have
D．all of the above

单项选择题

Sign language is said to be very picturesque and exact and can be used internationally except for （）

A．spelling
B．ideas
C．whole words
D．expressions