问答题

Men have been travelling across and around the equator on wheels, on their feet or in ships for thousands of years; but only a few men, with great difficulty and in very recent time, have ever crossed the ice to the North Pole. (Passage 1 )

【参考答案】

几千年以来，人们已经通过坐车，坐船或者步行穿过了赤道及其附近地区，但是最近只有少数人千辛万苦地越过寒冰到北极。
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单项选择题
Aeroplanes usually do not need to climb quickly or fly high in the polar region because ______.
A．they do not land there
B．there are no clouds at all
C．they can cross the ice with special equipment
D．it is very cold
单项选择题
Aeroplanes can climb quickly ______
A．in warm air
B．in cold air
C．when it reaches the polar region
D．only when the clouds are down low ______
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