在数据库设计的四个阶段中，每个阶段都有自己的设计内容。“为哪些表、在哪些字上、建什么样的索引”这一设计内容应该属于 ______ 设计阶段。
参考答案：物理
阅读理解。
Mr Green is a teacher of English . He comes from America . He teaches English in China. He speaks
English quite well.
He reads a lot of books and his wife Mrs Green often writes book for the students and reads then .
Het gets up at five in the morning . He leaves home at ten to six . He begins the first lesson at 8:00 . He
teaches English every day except Sunday. At ten o twelve he finishes his lessons. Ten minutes later he
has lunch .
In the afternoon he often plays games with his students at about four o' clock. Sometimes he teaches
his students at his room. Supper time is at about six. After that he reads newspaper and watches TV.
At about ten to eleven he goes to bed.
1.Mr Green is ________.
A. Chinese
B. Australian
C. English
D. an American
2. He leaves home at ________.
A. 5: 00
B. 5: 50
C. 6: 10
D. 6: 30
3. The students come to school every day except ________ in a week.
A. one day
B. two days
C. three days
D. four days
4.He has lunch at ________.
A.11: 30
B.12: 30
C.12: 00
D.11: 50
5. He watches TV or reads newspaper ________.
A. at six
B. after supper
C. before supper
D. in the afternoon
胸、腹部手术后预防肺不张可用（）
A.辅助通气
B.控制通气
C.两者均可
D.两者均否
