Noise pollution has been a problem in my hometown_________.

A.since then B.in the future C.once a week D.in the past

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How could we tell time if there were no watches or clocks anywhere in the world?

The sun is probably the world’s first “clock”, except in the far north, where the Eskimos(愛斯基摩人)live. There, it’s dark most of the winter, and bright most of the summer. But in most of the world, people have used the sun as a clock. Even today, if you don't have a clock, you can still know that when the sun shines, it’s day and when it’s dark, it’s night. The sun can also tell you if it's morning, noon, or afternoon.

Some people live near the sea. They have their special way to tell time. In the daytime, for about six hours, water rises higher and higher on the beach. And then it goes down and down for about six hours. The same thing happens again at night. There are two high tides and two low tides every 24 hours. Seamen on the ship learn how to tell time by looking at the moon and the stars. The whole sky is their clock.

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A.3 B.4 C.5 D.6

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Your eyesight may not become poorer ________ you spend much time on computer games.

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Now we keep_________touch with each other by email.

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