单选题 Questions 18--21 are based on the following passage.

单选题 which of the following is elected in the United States?
A. President. B. Vice-president.
C. The members of Congress. D. All of above.

【正确答案】 D

【答案解析】[解析] 18-21
In the United States, the president, the vice-president and the members of Congress are elected. The president is also the commander in chief of the national armed forces. Most of the government employees have to pass examinations to get their jobs. They serve the public in many ways. They not only make and carry out the laws, but also deliver letters, clean the streets, control traffic, and society. Outside the government, there are many other people who also serve the public, such as those in private hospitals and schools. All of these millions of people both inside and outside government can say that they are public servants.

文章第一句话“In the United States, the president, the vice-president and the members of Congress are elected”。

单选题 What do you know about the U.S. president?
A. He is elected. B. He is the highest army commander.
C. He is a public servant. D. All of above.

【正确答案】 D

【答案解析】关键词“elected, in chief of the national armed forces, serve the public”。

单选题 what do government employees have to do to get their jobs?
A. To pass examination. B. To serve the government.
C. To win election. D. To serve the public.

【正确答案】 A

【答案解析】关键句“Most of the government employees have to pass examinations to get their job”。

单选题 According to this passage, who is government employee?
A. Shop-assistant. B. Teacher in a private school.
C. Business man. D. Postman.

【正确答案】 C

【答案解析】关键句“They not only make and carry out the laws, but also deliver letters, clean the streets, control traffic, and society”。