19.As we enjoy the summer ocean waves along the beaches, we may think nervously about Steven Spielberg's Jaws and the great fear that sharks inspire in us. Yet we are happy to see global efforts to protect the declining number of sharks. The world has realized that we need the species, like sharks, to keep a balanced ecosystem. Sharks, in particular, are “in” these days. Thanks to good public policy and famous stars such as Jackie Chan and Ang Lee, killing sharks for fin soup is no longer cool. The demand for shark fins has been rising for decades, threatening sharks with extinction(灭绝)—up to 100 million sharks are killed each year just for their fins. But we have started to reverse the trend, particularly in many areas of the United States and overseas where restaurants once proudly provided delicious shark fins on the menu. In California, a ban on the sale and possession of shark fin soup has gone into effect this year through the efforts of Wild Aid and other organizations. Overseas marketing and public efforts featuring posters on public transportation systems and TV ads have been underway for the past few years. These efforts all show signs of success, on both the supply side and the demand side of trade in shark fins. Actually, stopping the killing of sharks is part of a broader movement to stop the killing of wild animals and the buying and selling of wildlife products. These products come from hunting elephants, tigers and rhinos, besides killing marine life. Whether it is shark fin soup or ivory piano keys, killing animals is big business. The hunting of elephants in search of ivory tusks for luxury(奢侈的)goods has become a full-scale war. The decrease of African elephant populations is alarming. Together with international partners, the United States is leading the worldwide effort to reduce demand for high-end products that rely on killing animals.
(1).The underlined word “reverse” in Paragraph 3 probably means _______.
A.show
B.keep
C.follow
D.change
(2).From the passage, we know _______.
A.the number of African elephants has been increased
B.a lot of wild animals have been killed for products
C.Steven Spielberg's Jaws inspires us to protect sharks
D.Jackie Chan and Ang Lee make fin soup popular
(3).What can we infer from the passage?
A.Shark fins will not be available any more in restaurants.
B.People have kicked the habit of having shark fin soup.
C.More animals for high-end products will be saved.
D.Global efforts have succeeded in stopping killing wild animals.
22.It is bad to have food stuck between your teeth for long periods of time. This is because food attracts germs(细菌), germs produce acid, and acid hurts your teeth and gums. Flossing(使用牙线) helps to remove the food that gets stuck between your teeth. This explains why flossing helps to keep your mouth healthy, but some doctors say that flossing can be also good for your heart. It may seem strange that something your do for your teeth can have any effect on your heart. Doctors have come up with a few ideas about how flossing works to keep your heart healthy. One idea is that the germs that hurt your teeth can leave the mouth and travel into your blood. Germs that get into the blood can then attack your heart. Another idea is based on the fact that when there are too many germs in your mouth, the body tries to fight against these germs. For some reason, the way the body fight these mouth germs may end up weakening the heart over time. Not every doctor agrees about these ideas. Some doctors think that the link between good flossing habits and good heart health is only a coincidence. The incidence(发生率) of two or more events is completely random, as they do not admit of any reliable cause and effect relationship between them. For example, every time I wash my car, it rains. This does not mean that when I wash my car, I somehow change the weather. This is only a coincidence. Similarly, some doctors think that people who have bad flossing habits just happen to also have heart problems, and people who have good flossing habits just happen to have healthy hearts. The theory that flossing your teeth helps to keep your heart healthy might not be true. But every doctor agrees that flossing is a great way to keep your teeth healthy. So even if flossing does not help your heart, it is sure to help your teeth. This is enough of a reason for everyone to floss their teeth every day.
(1).From the passage, we know that_____
A.not every doctor thinks flossing helps to keep your teeth healthy
B.food stuck between your teeth may hurt your teeth
C.doctors’ judgment about flossing is based on medical research
D.all of the doctors agree that flossing is good for your heart
(2).The underlined sentence in Paragraph 3 is to____.
A.Provide an example
B.Make a comparison
C.Introduce a new topic
D.Develop a previous statement
(3).Which of the following best states the main idea of the last paragraph?_______.
A.There is no good reason to believe that flossing will help your heart.
B.It is a fact that flossing can help your heart as well as your teeth.
C.Even if flossing is only good for your teeth, you should still do it every day.
D.Because doctors find flossing won’t help your heart, it is useless to floss.
