Read the passage and do the exercises according to the requests．

(阅读表达。)

阅读所给短文，并根据短文后题目的要求进行简答。?

　　Comic(喜剧的)book superhero Spider-Man uses tiny hairs on his fingertips to climb up walls．But he could have had another secret weapon to help him stick．

　　Scientists have now found that some spiders can also make silk in their feet, which may sometimes help them get a firmer grip on a surface．

　　Spiders are good at gripping walls with their legs．Thousands of little hairs on their feet make it possible．To test whether spiders also make these hairs wet to improve grip, scientists watched zebra tarantulas crawl(爬行)up glass slides．

　　When they tilted a glass slide until it was almost vertical, the spider slipped a few millimeters before attaching itself again．The scientists were surprised to see little threads(线)stretching from its feet to the slide．When they studied the spider’s feet under a special microscope, they found tiny silk-shooting spouts(吐出)among the hairs．

　　This was a surprise because scientists had previously thought spiders only use special organs near their stomachs to make silk．

　　It’s possible that, a long time ago, feet were the first body parts of spiders to produce silk．Only later in their evolutionary(进化)history did spiders develop spinnerets on their abdomens(腹部)to produce silk for webs(网)．

　　If so, the researchers say, this could mean that the silk’s original purpose was to , rather than to build homes or trap prey(猎物)．

1．What is the best title of the passage?(Please answer within 10 words．)

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2．Which sentence in the passage can be best replaced by the following one?

It has been discovered that the silk spouted from the feet of the spiders can assist them to get attached on objects．

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3．Fill in the blank with proper words or phrases．(Please answer within 10 words．)

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4．Translate the underlined sentence into Chinese．

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5．What can you learn from this discovery?(Please answer within 20 words．)

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阅读表达

　　The diamond is the hardest natural substance in the world．What causes this superhardness?Pressure and heat are the answers．The pressure has to be close to two million pounds．That’s per square inch．Much heat is required too．Experts say over 5,000 degrees．To make a diamond, one more thing is needed．This is ________．Pressure, heat, and carbon combine．They create a sparkling diamond．The very best are colorless．Pale blue stones─very rare─are high quality too．

　　Where do most diamonds come from?Over 97 percent come from Africa．The first diamond in Africa was not found by miners．Children found it, in 1866．They were playing in a shallow stream．One picked up “a pretty pebble”．The “pebble” was placed on the mantel of the fireplace．It was soon forgotten．Much later, a guest noticed the sparkle．He urged the farmer to have the stone looked at．He did．He took it to an expert in town．The “pebble” proved to be a diamond worth ＄2,500．That was a small fortune in those days．To date, the mines in Africa have produced over 1 billion dollars worth of diamonds．

　　Not all diamonds are found in Africa．Our hemisphere produced diamonds too．Brazil was a big producer in earlier times．The famous gem the Star of the South was found in brazil in 1853．

　　The gem the President Vargas was found more recently in Brazil．This was in 1938．A poor prospector found the stone．It was in the San Antonio River．It weighed 726.6 carats．The man sold the stone for ＄10,000 to a local broker．The broker almost immediately resold it．He got about ＄425,000．What a nice guy!

1．What is the best title of the passage?(Please answer within 10 words)

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2．Which sentence in the passage can be replaced by the following one?

Some diamonds are found in Africa but some are not．

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3．Please fill in the blank in the first paragraph with proper words or phrases to complete the sentence．(Please answer within 10 words)

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4．What do you think of the diamond in modern days?(Please answer within 30 words)

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5．Translate the underlined sentence in the first paragraph into Chinese．

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