_____ he was very tired, he continued working in his office.

A. Since  B.Although    C. As soon as     D. Because

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A. Have you ever been here before?

B. It’s beautiful.

C. How long have you been in Dandong?

D. Have a good time!

E. The seafood and the noodles are really delicious.

F. What places have you visited?

G. Where will you go then?

A: The traffic is very busy in the morning, isn’t it?

B: Yes, it is. Do you work here in Dandong?

A: No, I don’t. I’m just a tourist.

B: 1

A: Yes, I have been here three times.

B: 2

A: I have visited the Yalu River Bridge, Jinjiang Park and Mount Fenghuang.

B: What do you think of Dandong?

A: 3 It has changed a lot in the past few years.

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A: Thank you. Bye-bye!

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His sister’s never been to the Summer Palace, ____?

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 Robots _____more heavy work for us in the future.

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Is there intelligent (有智力的) life on other planets? For years, scientists said “no.” or “we don’t know.” But today this is changing. Seth Shostak and Alexandra Barnett are astronomers(天文學(xué)家). They believe intelligent life exists (存在) somewhere in the universe. They also think we sill soon contact these beings(人;生物).

Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life,” say Shostak and Barnett. The second reason is size—the universe is huge. “Tools like the Hubble Telescope(哈勃望遠鏡) have shown that there are at least 100 billion galaxies,” says Shostak. “And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar to Earth.”

In the past, it was hard to look for signs of intelligent life in the universe. But now, powerful telescopes(高倍望遠鏡) allow scientists to discover smaller planets—the size of Mars or Earth—in other solar systems. These planets might have intelligent life.

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