题目内容
About 1 in 15 households drink bottled water today, spending about $ 4 billion a year on it. Although the reasons for the trend are many, bottled water's health benefits fall near the top of the list. Surveys have found that about 25 percent of bottled water drinkers choose the beverage for health and safety reasons; another quarter believe it is pure and free of contaminants(杂质).
Regardless of its pristine image, bottled water is not necessarily any purer or more healthful than what flows right out of the tap. Consider that the Food and Drug Administration (FDA), the bottled water industry watchdog, does not require that bottled water meet higher standards for quality, such as the maximum level of contaminants, than public water supplies regulated by the EPA. For the most part, the FDA simply follows EPA's regulatory lead. Granted, bottled water is often filtered(过滤) to remove chemicals such as chlorine that may impart a certain taste. But that doesn't make it any safer. In fact, about 25 to 40 percent of bottled water comes from the same municipal water supplies as tap water. Furthermore, some bottled waters do not contain any or enough of the fluoride(氟化物) needed to fight cavities. The only way to determine whether a certain water contains the mineral is to check with the company that bottles it.
This is not to say that bottled water is necessarily any better or worse, from a health standpoint, than tap water. It's certainly preferable to tap water for those who like its taste. The problem is that many consumers pay 300 to 1,200 times more per gallon for bottled water than for tap water because they think bottled water is the more healthful of the two. Bottlers add to the confusion by sprinkling terms such as "pure", "crystal pure" and "premium" on labels illustrated with pictures of glaciers, mountain streams, and waterfalls, even when the water inside comes from a public reservoir. However, the FDA has set forth regulations requiring clear labeling of bottled waters. The miniglossary of bottled waters explains what some of the terms used on bottles really mean.
68. What conclusion can we draw from the passage?
A. Most bottled water drinkers buy it for the taste.
B. Labels on bottled water are used to mislead consumers.
C. The FDA sets high standards for bottled water.
D. Only wealthy people can afford bottled water.
69. According to the passage, removing chlorine from water____________
A. does not make the water safer B. is required by the FDA
C. makes the water less expensive D. is necessary for good health
70. According to the passage, one valid reason for drinking bottled water is the __________.
A. convenience B. cost. C. minerals D. taste
71. What’s the main idea of this passage?
A. Bottled water may be preferable to tap water in taste.
B. Bottled water is always safer to drink than tap water.
C. Consumers should consider carefully the reason for buying bottled water.
D. The Food and Drug Administration is responsible for the bottled water.
B A D C
阳光课堂课时优化作业系列答案Sharks have lived in the oceans for over 450 million years, long before dinosaurs appeared. There are now about 360 species of sharks, whose size, behavior, and other characteristics differ widely.
Every year, we catch and kill over 100 million sharks, mostly for food and for their fins. Dried shark fins are used to make shark fin soup, which sells for as much as $50 a bowl in fine Hong Kong restaurants. Other sharks are killed for sport and out of fear. Sharks are vulnerable(易受伤的) to overfishing because it takes most species 10 to 15 years to begin reproducing and they produce only a few offspring（后代）.
Influenced by movies and popular novels, most people see sharks as people-eating monsters. This is far from the truth. Every year, a few types of shark injure about 100 people worldwide and kill about 25. Most attacks are by great white sharks, which often feed on sea lions and other marine（海洋的） mammals. They sometimes mistake human swimmers for their normal prey, especially if they are wearing black wet suits.
If you are a typical ocean-goer, your chances of being killed by an unprovoked（非受挑衅而发生的）attack by a shark are about 1 in 100 million. You are more likely to be killed by a pig than a shark and thousands of times more likely to get killed when you drive a car.
Sharks help save human lives. In addition to providing people with food, they are helping us learn how to fight cancer, bacteria, and viruses. Sharks are very healthy and have aging processes similar to ours. Their highly effective immune system allows wounds to heal quickly without becoming infected, and their blood is being studied in connection with AIDS research.
Sharks are among the few animals in the world that almost never get cancer and eye cataracts（白内障）. Understanding why can help us improve human health. Chemicals taken from shark cartilage（软骨）have killed cancerous tumors in laboratory animals, research that someday could help prolong your life.
Sharks are needed in the world’s ocean ecosystems. Although they don’t need us, we need them. We are much more dangerous to sharks than they are to us. For every shark that bites a person, we kill one million sharks.
【小题1】Which of the following is NOT a reason why people kill sharks?
| A．People kill sharks for food. |
| B．People kill sharks for sport. |
| C．People kill sharks out of fear. |
| D．People kill sharks because they often attack swimmers. |
| A．There are many different species of sharks, but only a few of them are dangerous to humans. |
| B．Sharks never get ill. |
| C．Sharks are a valuable resource for human. |
| D．Sharks play an important role in the ocean ecosystem. |
| A．movies have given people the wrong impression of sharks |
| B．most sharks are dangerous to humans |
| C．sharks will attack anyone who is wearing black |
| D．it is dangerous to swim in the ocean |
| A．save | B．protect | C．lengthen | D．improve |
| A．Are Sharks Dangerous? | B．Sharks And Humans |
| C．Sharks: Humans’ Friends | D．Sharks Help Save Human Lives |