某公司发行一种债券，年利率为12%，按季计息，1年后还本，每张债券还本付息100元，计算其现值。
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班级组织的健康发展在很大程度上取决于班主任对班级成员的认知和理解程度。()
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.
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