Which of the following is a bad habit of the executive passengers that frustrates the airlines?(  )

• A、They do not book their seats in advance.
• B、They do not sit on the seats they are supposed to take.
• C、They do not travel on the flight they have booked.
• D、They do not pay in advance for the seats they book.

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

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?