4．What makes it possible for humans to live on other planets?

　　A．Our genetic makeup.

　　B．Resources on the earth.

　　C．The adaptive ability of humans.

　　D．By­products in space exploration.

　　答案：C　细节理解题。根据最后一段的第一句话可知，人类的适应能力会让人类在其他星球生存下去。

　　5．Which of the statements can best sum up the passage?

　　A．Space exploration has created many wonders.

　　B．Space exploration provides the best value for money.

　　C．Space exploration can benefit science and technology.

　　D．Space exploration may help us avoid potential problems on Earth.

　　答案：D　主旨大意题。A、B两项可以容易地排除。全文主要讲的是太空探索对帮助人类生存的益处，而不是对科技的益处。

　　B

　　If your cellphone suddenly stops working, don't blame the service provider. The malfunction(故障) might have been caused by something bigger—a solar storm. Experts expect that the earth will see more solar activities in the near future. The malfunction of electronic devices is just one of the effects.

　　Sunspots(太阳黑子) serve as an indicator of the sun's activity. For the past two years, sunspots have mostly been missing. Their absence, the longest in nearly 100 years, has taken even sun watchers by surprise.

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