题目内容：

 

The online review community Trip Advisor recently made a list of America’s top 10 zoos. You might be surprised that some of the nation’s most popular zoos are located in small or mid-size cities around the country. The following are four of these top zoos.

Henry Doorly Zoo in Omaha Never heard of Henry Doorly Zoo? Trip Advisor reviewers didn’t just rank (将……列为） it No. 1 in the country; they ranked it the No. 1 zoo in the world. There are all kinds of interesting activities and programs in this zoo and its aquarium. You won’t be disappointed if you visit it.

San Diego Zoo in San Diego Considered by many people to be a special zoo, San Diego Zoo supports the concept (概念） of open-air, cageless shows that re-create natural animal environments, with different animal species (物种） living side by side. If you want to know how animals live naturally in the wild, don’t miss it.

St. Louis Zoo in St. Louis It began as a single show during the 1904 World’s Fair (世博会）. Now it has grown to be St. Louis Zoo with over 700 different animal species. If you’ve got little ones, don’t miss this children’s zoo.

Memphis Zoo in Memphis This zoo has a history of over 100 years. It is home to more than 3,500 animals representing over 500 different species, including the giant panda. In 2008, Memphis Zoo was chosen to be the No. 1 zoo in the US on Trip Advisor.

1.According to the passage, we know that Henry Doorly Zoo    .

A. has an aquarium in it

B. sits in a small city

C. is the largest zoo in the world

D. is always the No. 1 zoo in America

2.Why is San Diego Zoo considered to be special?

A. It is free for the public.

B. Animals are not kept in cages there.

C. People can get close to wild animals there.

D. It has the largest number of animal species.

3.According to the passage, which of the following about Memphis Zoo is TRUE?

A. It has the longest history of the four.

B. There are about 500 animals in it.

C. It used to be the No. 1 zoo in the world.

D. It was highly praised by TripAdvisor.

4.The main purpose of the passage is to    .

A. compare the popularity of these zoos

B. show the popularity of zoos in America

C. show the result of TripAdvisor’s study

D. introduce several popular zoos in America