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　　While it is one of the most expensive ways to see San Francisco, touring the city from the air is one of the most unique and exciting ways to see the city. Seeing the city from high above allows you to get a full view of the city as tour guides point out attractions from high above. If you do decide to tour San Francisco by air, you'll be creating memories that you won't forget forever.

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　21.How should you tour San Francisco in order to appreciate its buildings?

　　A. By air B. By bus C. On foot. D. By boat

　22. What can we learn about the waters of San Francisco Bay?

　　A. They have high-quality sea water

　　B. They are explored on a localized level

　　C. They were not in use until the last century

　　D. They have helped the city to develop

　23. Where can we most probably read this text?

　　A. In a magazine B. In a newspaper C. On a website D. On TV

B.

The older we get, the more we learn. the better able we are to know what's right. Right? Not always. Sometimes the aging process can remove completely the natural aspects that keep us curious and give us strength to figure out what to do. As a matter of fact，children of all ages teach us lessons in our own lives.

When a kid says" That wasn't nice" or" I don't like your shirt" or "I hate that kind of food!", it's a natural reaction(反应)to shush the child not to do so, but what they say is true. When children see a wrong being done, they will interrupt to say it's not right. As adults, we usually sit nearby rather than hold a strong opinion or say something that might be unpopular.

　　Kids cry, stamp( 跺) their feet or yell with excitement while it isn't socially acceptable for an adult. Letting emotions out and then moving on to deal with things, so jump and yell "yippee" when you are happy about something. Have a good cry when being upset. Stamp or throw a pillow when being alone and need to release. Most of life becomes a series of things once you reach a certain age. Finding pleasure and laughing seems out of place or silly when gaining knowledge or skills.

　　"Why is the sky blue?" " How much does an elephant weigh?" There are certain things that the Internet can tell you, but what about learning something in the first hand like the science experiment in the kitchen, digging up rocks in the backyard, how high the bicycle's wheels can fly over the gravel( 砂砾)? Don't stop exploring and find new learnings in the real world.

24. What can we know from the text?

A. Adults know what is right better than children

B. Children often show their inner feelings directly

C. Adults look for their future happiness easily

D. Adults like to express their own opinions freely

25. What's the purpose of the author's writing the last paragraph?

A. To remind us to try to enjoy life to the fullest

B. To persuade us not to rely much on the Internet

C. To warn us to keep curious about things around us.

D. To encourage us to take an active part in life by ourselves.

26. What is the passage mainly telling us about?

A. Being adults is different from children

B. Being adults doesn't mean we are smarter.

C. It's not easy for children to grow into adults

D. It's necessary to listen to what the children say.

C.

The words "protect animals" appear everywhere in books and on screens because some animals are in danger of dying out. But sometimes the reality can be a little different from what people read or watch.

Florida, US, has held its first bear hunt since 1994. The local government gave people nearly 4,000 permits to kill black bears. And more than 200 were killed on Oct 24.

Animal protection groups protested this decision. But local officials explained that the black bear population had grown to 3,500 and become a menace to local people. In the past two years, bears have hurt at least four people in Florida.

This brings an old question back into the spotlight - which is more important, protecting animals or protecting people's interests?

This question is asked in other countries too. In Switzerland, a wolf was sentenced to death by the Swiss government months ago. This is because the wolf killed 38 sheep and local people lost a lot of money. Days ago in China, three old men were arrested for killing a serow(鬣羚), a protected species. But they insisted they didn't know about this and killed the animal because it ruined their crops.

However, these stories don't always mean that animal protection stops due to human interests, especially involving economic development. A man named Zhou Weisen set up a wild animal base in Guilin, Guangxi. He saved over 170 tigers and 300 bears. But his base also offered jobs to local people.

"There may never be a standard answer to the question of whether we should give more attention to the environment or human development," said Robert May, a British biologist at Oxford University. "But we shouldn't push either one to the side, as the future is hanging in the balance.

27. What does the underlined word " menace" in the second paragraph mean?

　A. danger B. chance C. relief D. treasure

28. What does the author intend to tell us by mentioning Zhou Weisen 's story?

　A. Protecting animals needs hard work

　B. Zhou was good at feeding wild animals

　C. Zhou had a good relationship with local people

　D. Protecting animals can bring economic development

29. Which of the following statements might Robert May agree with?