单项选择题

Ice crystals do NOT immediately fall to Earth because ______.

A．they are kept aloft by air currents
B．they combine with other chemicals in the atmosphere
C．most of them evaporate
D．their electrical charges draw them away from the earth

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热门试题

单项选择题

The word random in Line 2, Para. 2 is closest in meaning to ______.

A．unpredictable
B．perplexing
C．independent
D．abnormal

单项选择题

Gandhi and Martin Luther King are typical examples of outstanding leaders who ______.

A．are good at demonstrating their charming characters
B．can move the masses with their forceful speeches
C．are capable of meeting all challenges and hardships
D．can provide an answer to the problems of their people