单项选择题
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
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.
A．blood B．wet areas C．cold weather D．dry climates