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【简答题】
Operating systems are normally (1) to their manufacturers and the (2) in which they are run. Generally , when a new computer (3) is installed, operational (4) suitable to that hardware is purchased. (5) want reliable operational software that can effectively support their (6) activities. Loading (7) is only one of the operating system ’ s m any supporting (8). It consists of software modules that insulate the(9) from the hardwa re, t hus relieving the programmer of some very complex (10) of programming and making the system easier to use.
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反馈参考答案：
举一反三
【单选题】董老师上游戏课时,小明总爱举手,但答题经常出错,小强不爱举手,但老师点名提问却总能答对。老师的下列做法中,最合适的是
A.
批评小明总出错，表扬小强爱思考
B.
表扬小明爱举手，批评小强不发言
C.
批评小明总出错，批评小强不发言
D.
激励小明勤思考，鼓励小强多举手
【单选题】He has no idea what the book is about. He ______________ it very carefully.
A.
shouldn’t have read
B.
can’t have read
C.
mustn’t have read
D.
wouldn’t have read
【单选题】He has no idea what the book is about, he _____ have read it very carefully.
A.
can’t
B.
mustn’t
C.
may not
D.
must
【单选题】He has no idea what the book is about. He ______________ it very carefully.
A.
shouldn’t have read
B.
can’t have read
C.
mustn’t have read
D.
wouldn’t have
【单选题】He has no idea what the book is about．He have read it very carefully．
A.
needn’t
B.
shouldn’t
C.
can’t
D.
mustn’t
【单选题】He has no idea what the book is about. He ______read the book.
A.
couldn’t
B.
couldn’t have
C.
mightn’t have
D.
shouldn’t have
【单选题】He has no idea what the book is about. He ______read the book.
A.
a. couldn’t
B.
b. couldn’t have
C.
c. mightn’t have
D.
d. shouldn’t have
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