题目内容

About 10 years ago, you could hardly get（）information about the PC.

A. no
B. any
C. some
D. certain

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Every chemical change either results from energy being used to produce the change, or causes the energy to ________ in some form.

A. give off
B. put out
C. set off
D. use up

A mother is naturally（）towards her children anyway.

A. acceptable
B. secure
C. protective
D. lovely

（）the failure, he was determined to continue studying on the topic.

A. Because of
B. Despite
C. Though
D. Instead of

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A. 可用性的攻击
B. 保密性的攻击
C. 完整性的攻击
D. 真实性的攻击