单项选择题

The US refused to join the 1997 Kyoto protocol because it ______.

A．thought it unnecessary to deal with the global warming
B．found it impossible to reach the goal set by the protocol
C．doubted whether it was treated equal as the biggest polluter
D．believed that control of oil use would be more effective

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单项选择题

Concerned with the rising temperature of the earth, Tony Juniper suggests that ______.

A．there is no way to prevent the serious consequences
B．it has to be stopped with the help of politicians
C．measures should be carried out immediately to stop it
D．the serious consequences cannot be predicted

单项选择题

What is the most alarming consequence of the fast growing population

A．Species are dying out at an unnatural high speed.
B．Living areas for wildlife are disappearing rapidly.
C．The global weather is becoming warmer.
D．All kinds of natural resources are draining.