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【单选题】
使用数据提供程序访问数据库,当执行 select 命令检索数据表, 并返回数据集对象 时,需要调用 Command 对象的()方法。A.
ExecuteReader
B.
ExecuteScalar
C.
ExecuteNonQuery
D.
Open
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举一反三
【单选题】Which of the following is TRUE?
A.
Sometimes we can not see a thing because we look directly at it.
B.
Sometimes we can not see a thing because we use the sides of eyes to see it.
C.
The center of the eye is more sensitive than the sides of the eye after dark.
D.
The center of the eye is as sensitive as the sides of the eye in daylight.
【简答题】Excuse me, we can’t ____________ our tickets. A．look for B．find C．to look for D．to find
【多选题】If we want to look for the explanations of something, we can ( ).（多选）
A.
check whether what one said is true
B.
ask why questions several times
C.
ask wh- questions
D.
see what we can do about it
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