According to the passage, in operating airlines it is essential to     .(  )

• A、keep in mind the need. of the executives only
• B、satisfy the need of the low fare passengers at the expense of the executives
• C、try to attract as many passengers as possible by reducing fares
• D、cater to the need of passengers setting at both ends of the jets

21. It was once believed       ,and thus we can tell how successful he/ she will be in the future according to his/her intelligence.

22. More recent researches has shown that intelligence is only partly inherited      .

23. We. can observe and measure observed intelligence, but genetic intelligence      .

24. It can be inferred from the passage that a child will      if he has more opportunities to communicate with others by means of language.

25. Children were not just      ,but they can be taught to be more intelligent at school.

A. born to be more intelligent or less intelligent

B. have 8 better chance to develop, his intelligence

C. can't be observed and measured

D. that intelligence was something a baby was born with

E. and because of the lack of communication with his classmates

F. and partly has to do with a child's living environment

第七部分:短文写作(第51题,30分)

51.请根据下列材料写一篇150词左右的英语短文。

Recently,a few people in China have been confirmed to be infected with the H7N9 bird flu virus. The health authority has taken some measures to control the situation. Can you give some suggestions to keep yourself from being infected?