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。

　　阅读理解阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。China is a land of bicycles. At least it was back in 1992 when I traveled the country. Back then everyone seemed to be riding a bicycle. Millions of them, all black. Cars were rare. Yet since my arrival in Beijing last year, I've found the opposite is true. There are millions of cars. However, people still use their bicycles to get around. For many, it's the easiest and cheapest way to travel today. Bicycles also come in different colors — silver, green, red, blue, yellow, whatever you want.

　　It's fun watching people biking. They rush quickly through crossroads, move skillfully through traffic, and ride even on sidewalks (人行道)．Bicycles allow people the freedom to move about that cars just can't provide.

　　Eager to be part of this aspect of Chinese culture, I decided to buy a bicycle. Great weather accompanied my great buy.I immediately jumped up on my bicycle seat and started home.

　　My first ride home was orderly (守秩序的)．To be safe, I stayed with a “pack” of bikers while cars on the streets came running swiftly out of nowhere at times. I didn't want to get hit. So I took the ride carefully.

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