Measles(麻疹), which once killed 450 children each year and disabled even more, was nearly wiped out in the United States 14 years ago by the universal use of the MMR vaccine(疫苗). But the disease is making a comeback, caused by a growing anti-vaccine movement and misinformation that is spreading quickly. Already this year, 115 measles cases have been reported in the USA, compared with 189 for all of last year.

The numbers might sound small, but they are the leading edge of a dangerous trend. When vaccination rates are very high, as they still are in the nation as a whole, everyone is protected. This is called “herd immunity”, which protects the people who get hurt easily, including those who can’t be vaccinated for medical reasons, babies too young to get vaccinated and people on whom the vaccine doesn’t work.

But herd immunity works only when nearly the whole herd joins in. When some refuse vaccination and seek a free ride, immunity breaks down and everyone is in even bigger danger.

That’s exactly what is happening in small neighborhoods around the country from Orange County, California, where 22 measles cases were reported this month, to Brooklyn, N.Y., where a 17-year-old caused an outbreak last year.

The resistance to vaccine has continued for decades, and it is driven by a real but very small risk. Those who refuse to take that risk selfishly make others suffer.

Making things worse are state laws that make it too easy to opt out(决定不参加) of what are supposed to be required vaccines for all children entering kindergarten. Seventeen states allow parents to get an exemption(豁免), sometimes just by signing a paper saying they personally object to a vaccine.

Now, several states are moving to tighten laws by adding new regulations for opting out. But no one does enough to limit exemptions.

Parents ought to be able to opt out only for limited medical or religious reasons. But personal opinions? Not good enough. Everyone enjoys the life-saving benefits vaccines provide, but they’ll exist only as long as everyone shares in the risks.

1.The first two paragraphs suggest that ____________.

A.a small number of measles cases can start a dangerous trend

B.the outbreak of measles attracts the public attention

C.anti-vaccine movement has its medical reasons

D.information about measles spreads quickly

2.Herd immunity works well when ____________.

A.exemptions are allowed

B.several vaccines are used together

C.the whole neighborhood is involved in

D.new regulations are added to the state laws

3.What is the main reason for the comeback of measles?

A.The overuse of vaccine.

B.The lack of medical care.

C.The features of measles itself.

D.The vaccine opt-outs of some people.

4.What is the purpose of the passage?

A.To introduce the idea of exemption.

B.To discuss methods to cure measles.

C.To stress the importance of vaccination.

D.To appeal for equal rights in medical treatment.

第三部分:阅读理解(共15小题;每小题2分,满分30分)

请阅读下列短文,从短文后各题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

A

CHRONOLOGICA

——The Unbelievable Years that Defined History

DID YOU KNOW…

In 105 AD paper was invented in China?

When Columbus discovered the New World?

The British Museum opened in 1759?

CHRONOLOGICA is a fascinating journey through time,from the foundation of Rome to the creation of the internet.Along the way are tales of kings and queens,hot air balloons…and monkeys in space.

Travel through 100 of the most unbelievable years in world history and learn why being a Roman Emperor wasn’t always as good as it sounds,how the Hundred Years’ War didn’t actually last for 100 years and why Spencer Perceval holds a rather unfortunate record.

CHRONOLOGICA is an informative and entertaining tour into history,beautifully illustrated and full of unbelievable facts.While CHRONOLOGICA tells the stories of famous people in history such as Thomas Edison and Alexander the Great,this book also gives an account of the lives of lesser-known individuals including the explorer Mungo Park and sculptor Gutzon Borglum.

This complete but brief historical collection is certain to entertain readers young and old,and guaranteed to present even the biggest history lover with something new!

1.What is CHRONOLOGICA according to the next?

A.A biography. B.A travel guide.

C.A history book. D.A science fiction.

2.How does the writer recommend CHRONOLOGICA to readers?

A.By giving details of its collection.

B.By introducing some of its contents.

C.By telling stories at the beginning.

D.By comparing it with other books.

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