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27. (2019ɽ¶«ÁÙÒÊ)Melting ice (ÈÚ±ù) can cause sea levels to rise. Since 1993, sea levels _________at a speed of 32 cm every 10 years. A. rose B. have risen C. rise

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(2019ɽ¶«ÁÙÒÊ) Do you often listen to music at loud volumes (ÒôÁ¿)? You should know that this habit is bad for your hearing. Over 1 billion young people are at risk of hearing loss (ÌýÁ¦É¥Ê§) ,because of

listening to loud noise for long periods of time. Listening to music or watching a TV show at loud volumes can harm your hearing.

The United Nations has standards for safe listening. It is not safe to listen to sounds that are louder than 85 dB (·Ö±´) for eight hours or 100 dB for 15 minutes. The sound of a busy road is about 85 dB and the sound of a rock concert can be about 100 dB.

Loud noise is harmful to the inner¶þMost of us are bon with about 16,000 hair cells (Ìýëϸ°û) in our inner ears. These cells notice sounds. However, listening to loud noise for a long time can make these cells work too hard and cause some of them to die. This is what causes hearing loss. Once this happens, it's hard to get your hearing back.

Some people might think that their music isn't all that loud. But this can depend on where you are. For example, if you are in a noisy place like the subway, you might turn up your music too loud without realizing it. Later, when you listen to it at the same volume in a quiet place, you alight feel uncomfortable

The \about equal to (Ï൱ÓÚ) the noise of a subway.

Here is some advice on safe listening. Over-the-ear headphones (Í·´÷ʽ¶ú»ú) are better than in-ear ones. They do a better job of stopping outside noise, so you can listen at a lower volume. Don't listen to loud music on your headphones for a long time. Follow the 60:60 rule: listen to music at 60 percent of your headphones' maximum volume for no more than 60 minutes a day.

¸ù¾Ý¶ÌÎÄÄÚÈÝ£¬ÅжÏÏÂÁоä×ÓÕýÎó¡£ÕýÈ·µÄÓá°A¡±±íʾ£¬²»ÕýÈ·µÄÓá°B¡±±íʾ¡£ 31. It is safe to listen to sounds that are louder than 100 dB for 15 minutes

32. Listening to loud noise for a long time can cause some hair cells in the inner ear to die. 33. From the fourth paragraph, we know people don't always realize how loud their music is. 34. In-ear headphones are better than over-the-eat ones because they can stop more outside noise.

35. This article mainly tells us why ears are an important part of our bodies. Ìâ²Ä ˵Ã÷ÎÄ »°Ìâ ¿ÆÆÕ֪ʶ ´ÊÊý 344 ¡¾Ö÷Ö¼´óÒâ¡¿±¾ÎÄÊÇһƪ˵Ã÷ÎÄ£¬±¾ÎĽéÉÜÁ˳¬¹ý85·Ö±´µÄÉùÒô£¬¶ÔÈËÌýÁ¦µÄË𺦲¢Ìá³ö°²È«ÇãÌýµÄ½¨Òé¡£

31. B ϸ½ÚÀí½âÌâ¡£¸ù¾ÝµÚ¶þ¶ÎµÚ¶þ¾äIt is not safe to listen to sounds that are louder than 85 dB for eight hours or 100 dB for 15 minutes.¿ÉÖª£¬Ìý85·Ö±´ÒÔÉϵÄÉùÒô8Сʱ»ò100·Ö±´ÒÔÉϵÄÉùÒô15·ÖÖÓÊDz»°²È«µÄ¡£¹Ê±íÊöÓëÔ­ÎIJ»Ïà·û¡£

32. Aϸ½ÚÀí½âÌâ¡£¸ù¾ÝµÚÈý¶ÎµÚËľä However, listening to loud noise for a long time can make these cells work too hard, and cause some of them to die.¿ÉÖª£¬È»¶ø£¬³¤Ê±¼äÌýÌ«´óµÄÔëÒô»áʹÕâЩϸ°û¹¤×÷¹ý¶È£¬µ¼ÖÂһЩϸ°ûËÀÍö¡£¹Ê±íÊöÓëÔ­ÎÄÏà·û¡£

33. Aϸ½ÚÀí½âÌâ¡£¸ù¾ÝµÚËĶεÚËľäFor example, if you are in a noisy place like the subway, you might turn up your music too loud without realizing it.¿ÉÖª£¬ÀýÈ磬Èç¹ûÄãÔÚÏñµØÌúÕâÑùàÐÔӵĵط½£¬Äã¿ÉÄÜ»á°ÑÒôÀÖ¿ªµÃÌ«´ó¶øûÓÐÒâʶµ½¡£¹Ê±íÊöÓëÔ­ÎıíÊöÏà·û¡£ 34. B ϸ½ÚÀí½âÌâ¡£¸ù¾Ý×îºóÒ»¶ÎµÚ¶þ¾äOver-the- ear headphones are better than in-ear ones. ¿ÉÖª£¬´÷ÔÚ¶ú¶äÍâÃæµÄ¶ú»ú±È´÷ÔÚ¶ú¶äÀïµÄºÃ¡£¹Ê±¾¾ä±íÊöÓëÔ­ÎIJ»·û¡£

35. B Ö÷Ö¼´óÒâÌâ¡£±¾ÎÄÖ÷Òª½éÉÜÁ˸ßÒô¶ÔÈËÃÇÌýÁ¦Ëðº¦ÒÔ¼°¸øÈËÃǵÄһЩ½¨Òé¡£¹Ê±íÊöÓëÔ­ÎIJ»·û¡£

B (2019ɽ¶«ÁÙÒÊ) Do you want to improve your physics and chemistry grades? Well, maybe you should first learn something about the struggles (·Ü¶·) of great scientists.

The American Psychological Association did an interesting study. More than 400 students from schools in New York City took part in it. The students were divided into three groups. Group 1 read a typical textbook that describes the achievements of great scientists. Group 2 read about those scientists' personal struggles. For example, as a Jew, Einstein (°®Òò˹̹) ran away from Nazi Germany to avoid persecution (ÆȺ¦). The last group read about the scientists' intellectual struggles, such as Marie Curie's failed scientific tests. These stories about struggles also told students how the scientists dealt with these obstaclesÕÏ°­) .

The students took a science exam before the study. After the six-week study, they took another. Scientists found those in Groups 2 and 3 improved their science grades. Students in Group 1 didn't see a grade increase. Some of them even had lower grades after the study. The study was led by Xiaodong Lin-Siegler, a teacher at Columbia University. According to Xiaodong, kids often think Einstein was truly intelligent. They believe they will never match him. Many of them fail to realize that any success requires a long journey. Along the way, there are many failuresʧ°Ü) .

Students who read the struggle stories more probably said that great scientists were like themselves. The \

Xiaodong says today's science textbooks fail to bring science to life. As a result, students seldom regard science as part of their everyday lives. Instead, they just see a long list of facts that they have to remember. Xiaodong thinks textbooks should include more stories about how great scientists had to struggle to succeed. And students should focus more on how these scientists dealt with the obstacles they met along the way. ¸ù¾Ý¶ÌÎÄÄÚÈÝ£¬Ñ¡Ôñ×î¼Ñ´ð°¸¡£

36. According to the article, students can improve their physics and chemistry grades by _______. A. reading the achievements of great scientists more carefully B. listening more carefully to their physics and chemistry teachers

C. learning about how great scientists dealt with their obstacles

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