题目内容
听力原文： The U.S. Botanic Garden is America's plant museum. (26) Congress established the Botanic Garden as a center for the science of growing things. But the Garden is also a center of beauty.
(28) The Botanic Garden has twenty-five thousand plants in its collection. (27) Visitors can see many of them in the Garden's public Conservatory. It is a large stone and glass structure near the U.S. Capitol building.
There is a titan arum plant at the U.S. Botanic Garden. It is called the "corpse plant" because its flower smells something like a dead body. Everywhere you look in the Conservatory, something appeals to your eyes. (28) A visitor can move seemingly from one part of Earth to another in just a few seconds. A short walk takes you from desert to thick forest.
(28) The Conservatory offers examples of plants that provide the makings of medicine. It also has plants of special interest to children. (28) Rare and endangered plants occupy a place all their own.
Why did the Congress establish the U.S. Botanic Garden？
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According to the passage, what is the main cause of preventable hearing loss？
How many people's life can be saved by making the environmental conditions healthier？
听力原文： (14)We've become alarmed over the health center by the number of students who are experiencing hearing loss. First, I want to go over some basics about hearing. Then we can take a look at our school environment and see if we can figure out some ways to protect hearing. (16) The leading cause of preventable hearing loss is excessive noise. Too much moderate noise for a long time or some types of intense noise for even a short time can damage hearing. Loudness is measured by decibels. One decibel is the lowest sound the average person can hear. Sounds up to 80 decibels generally aren't harmful. That's noise like traffic on a busy street. But anything louder than 80 decibels may hurt your hearing. (15) Once you are up to 140 decibels, that's like a jet plane taking off, then you might even feel pain in your ears. Those are sure sign that your hearing's at risk. Even one exposure to a really loud noise at close range can cause hearing loss. So what you need to do is limit your exposure to harmful levels. If you pass along this handout, we can take a look at the decibel level of some common campus sounds. Notice how loud those horns are that people take to football games. They are really dangerous if blown right behind you.
What is this passage talking about？
听力原文：W: So, how are things going, Steve？
M: Well, to be honest, Carla, I was feeling great on Saturday, but I started to feel sick Sunday afternoon. I thought I'd get better, but I feel worse than before. [5] And I'm really worried because I'm scheduled to give a presentation at work on Friday,so I have to be better by, then,
W: Well, what seems to be the problem？
M: Well, I thought I had the flu, but the doctor said it was just a bad cold. He gave me some medicine to take care of my stuffy nose and fever. [4] I'm supposed to take the medicine three times a day after eating, but it doesn't seem to help. [4] He also told me to stay off my feet for a day or so, but I'm so busy these days.
W: Listen! Forget about that medicine! I have just the thing to get rid of bad colds. You see, my mom is really into herbal medicine,
M: Oh, no, thanks.
W: Ah, come on! Give it a try. You just take some of my mom's herbal tea and drink it four times a day. Believe me. You'll be up and dancing around in no time.
M: Dancing around in no time, right？ [6] Well, I guess. Nothing else seems to be doing the job.
W: Great. I'll come by your place at 7:30. See you then.
The doctor asked Steve to
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