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.

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单项选择题

According to the first paragraph, we can say that ______.

A．the weather always remains the same in a day
B．a fine day can't last for long
C．we rarely think about the weather
D．the weather changes a lot

单项选择题

The author suggests that all mosquitoes like ______.

A．blood
B．wet areas
C．cold weather
D．dry climates