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听力原文：TUVALU, a tiny country in the Pacific Ocean, has asked for help as it fears it wi

听力原文： TUVALU, a tiny country in the Pacific Ocean, has asked for help as it fears it will be swallowed up by the sea. Storms and huge waves are a constant threat and none of Tuvalu's nine little islands is more than five meters above sea level. Salt water is already entering the country's drinking water supply, as well as damaging plants that produce fruit and vegetable. Without urgent help, the country's days are numbered. But Tuvalu is not the first place to face sinking into the sea. Venice, a historic city in Italy, best known for its canals, has sunk about 24 cm over the past 100 years.

Experts say that it will have sunk another 20-50 cm by 2050. A century ago, St. Mark's Square, the lowest point in the city, flooded about nine times a year. Nowadays, it happens more than 100 times. While Venice is slowly sinking into the mud on which it stands. Tuvalu's rising sea level is caused by global warming. The average global temperatures also make water expand, so it takes up more space, causing the sea level to rise. The sea level has risen about 10-25 cm in the last 100 years. The main cause of global warming is human pollution. Through burning coal, oil and gas, people have been increasing the greenhouse gases in the atmosphere, such as CO2. This adds to the power of the greenhouse effect, making the planet even warmer.

(30)

A．It is in the Atlantic Ocean.

B．It has almost been swallowed by the sea.

C．It consists of 9 islands.

D．It is famous for its canal.

提问人：网友boyheng 发布时间：2022-01-06

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第5题

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第9题

听力原文：M: Did you know that astronauts have made commercial products in space？W: No. I w

听力原文： M: Did you know that astronauts have made commercial products in space？

W: No. I wasn't aware of that. What kind of products？

M: Tiny plastic beads.

W: Beads？ Do you mean to tell me that astronauts have nothing better to do than make jewelry beads in space？ It seems to me that they can make more useful things out there.

M: Oh ! But these plastic beads aren't for jewelry. They can be used for many scientific purposes, from conducting cancer research to calibrating microscopes.

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M: Because earth’s gravitational pull affects the beads. The beads produces on earth are distorted not exactly round. The ones made in space are precise spheres.

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In 1978, Sony engineers started shrinking stereo components. They could fit in playback parts and two tiny speakers, but not the recording mechanism.

One day Masaru Ibuka, Sony's co-founder, wandered by and heard the small stereo. He recalled a project being developed elsewhere in the company—lightweight headphones.

"What if you got rid of the speakers and combined your stereo with the headphones？" asked Ibuka. "The headphones would use less power and increase the quality of the sound.

Soon the teenagers discovered the new invention. Perfect for sports, small enough to fit into the pocket, the Walkman became a raging success.

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A．How Sony engineers improved sound quality.

B．How a popular product was invented.

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D．How Sony stereos became a raging success.

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