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【简答题】
____________(毫无疑问), coffee is not for everyone. If you drink too much, it can increase nervousness, and cause rapid heartbeat and trembling hands.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】It can be inferred from the first paragraph that Zero Day
A.
is part of Microsoft's Windows operating system.
B.
can help a computer to avoid online criminals.
C.
is offered by legitimate Web sites.
D.
can control a computer through its system weakness.