There was a strange sound outside. Mary

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问题选择题

There was a strange sound outside. Mary went out and _____ around, but she _____ nothing. [ ]

A. looked; saw

B. saw; saw

C. watched; looked

D. looked; find

答案

答案：A

单项选择题

建立一个学生信息表student，要求它由学号sno，姓名sname，性别sex，年龄age，4个属性组成，其学号属性唯一，学号、姓名字段不能为空。下列语句正确的是

A．CREATE TABLE student (sno char(5)NOT NULL sname char(8)NOT NULL sex char(1) age in；

B．CREATE TABLE student (sno char(5)NOT NULL UNIQUE sname char(8) sex char(1) age in；

C．CREATE TABLE (sno char(5)NOT NULL UNIQUE sname char(8)NOT NULL sex char(1) age in；

D．CREATE TABLE student (sno char(5)NOT NULL UNIQUE sname char(8)NOT NULL sex char(1) age in；

单项选择题

莫霍面上下两侧名称分别是（）

A.地幔和地壳

B.岩石圈和地壳

C.地幔和地核

D.地壳和地幔