单项选择题

From Para.1 we can infer that ______.

A．certain general is delivering a speech to his soldiers
B．the army is going to fight against the most deadly enemies
C．more and more people are needed to join the army
D．the author is trying to arouse people's awareness about the upcoming threat

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单项选择题

Which of the following statements is true

A．The author is angry that the earth's natural resources are being destroyed by human's enemies.
B．People are turning a deaf ear to their own destructive behaviors towards earth.
C．People should exploit more natural resources to end the current energy shortage.
D．People feel helpless in saving the earth.

单项选择题

We can infer from the passage that ______.

A．the author has lost confidence completely in people's ability to face the threat
B．it is too late for the human being to take action to combat the threat
C．some people have sensed the danger but fail to take action
D．it is people's laziness that causes the undesirable consequences