Since 1582, the maximum number of leap years possible in any decade is ______.
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现有甲、乙、丙三个独立基础，划分A、B、C、D四个施工过程，流水节拍如下表所示，每个基础C工作完成后需留一天时间给监理工程师检查验收，则该工程的计划工期为()天。
A. 21
B. 20
C. 19
D. 18
Why does Blair sometimes show up in a formal event without a tie？
A. Because he wants to make a show.
Because he wants to attract attention,
C. Because ties are costly,
D. Because he wants to live in a casual w&y.
The author says that modern weapons ______.
A. will help abolish war
B. put mankind in grave danger
C. wii1 gradually become part of man's life
D. need further improving
The key point of the passage is that ______.
A. stricter discipline should be maintained in schools and families
B. more good examples should be set for people to follow
C. more restrictions should be imposed on people's behaviour
D. more people should accept the value of accountability
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