单项选择题

This passage is mainly about _______.

A．the relation between the weather and clouds
B．the ways of grouping and naming clouds
C．the causes of differences in weather
D．the signs of the rain and storm

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单项选择题

Which of the following statements is TRUE

A．If clouds are high, there will be bad weather.
B．The color of clouds is a factor to help predict the weather.
C．If the weather is good, the clouds must be very low.
D．To study clouds is the only way to understand the weather.

单项选择题

_______ he can recover soon, I don't mind how much money I have to pay.

A．So long as
B．So far as
C．In case
D．when