单项选择题

Mother insisted that______.

A. they are to be back before nine in the evening
B. they ought to be back before nine in the evening
C. they be back before nine in the evening
D. they had to be back before nine in the evening

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单项选择题

Some African people once drank animal urine______.

A．when they were going to die
B．because they were thirsty
C．because there was little salt
D．because they were short of water

单项选择题

What is the best title of the passage

A．Severe Thunderstorms and Damages.
B．Weather Forecasting and Life-threatening.
C．Science Advances and Nowcasts.
D．Available Data and Nowcasts.