高三英语备考总复习人教版必修3同步练习：3-4_高考复习指南

高三英语备考总复习人教版必修3同步练习：3-4

　　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。

　　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.

　　When the number of sunspots drops at the end of each 11year cycle, solar storms die down and all become much calmer. This “solar minimum” doesn't last long. Within a

　　year, sunspots and solar storms begin to build toward a new crescendo,_the next solar maximum.

　　What's special about this latest cycle is that the sun is having trouble starting the next solar cycle. The sun began to calm down in late 2007, so no one expected many sunspots in 2008. They should return in 2010. Scientists have predicted that the next solar cycle could be the most active on record: more sunspots and more solar storms.