单项选择题

The warming weather of the past hundred years may（）

A．begin
B．end
C．be another ice age
D．start

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单项选择题

The temperature of the world in the past ten years has dropped a little （）

A．because wind and rain changed the weather
B．the drop in the temperature would have effects on wind and rain
C．because wind and rain did not change the weather
D．the drop in the temperature would not have effects on wind and rain

单项选择题

Scientists imagine such a change in weather on human population would be （）

A．terrified
B．surprised
C．horrible
D．frightened