题目内容

It is time that he realized he had made a stupid mistake.

A. 该是他充分认识到自己的行为是不恰当的时候了。
B. 该是他认识到自己犯了一个愚蠢的错误的时候了。
C. 他意识到自己犯了一个愚蠢的错误。

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We must obey the traffic regulations, or we may be punished.

A. 我们必须遵守交通法规，不然可能受到惩罚。
B. 我们应该遵守法规，否则我们可能受到批评。
C. 为了安全，我们必须严格遵守交通法规。

英译汉A language may become extinct when the last person who can speak it passes away. According to linguists，the disappearance of a language is nothing unusual. There are many reasons why a language dies out. These reasons include natural factors，social factors, cultural factors and so on. It is very important for people to protect as many languages as possible. When languages die out，mankind's wisdom will be reduced.

假设你是校学生会的主席李华，新年即将到来，为了帮助学校的外国留学生更好地了解中国文化，学生会将为他们举办一个新年晚会。请你给这些留学生写一份通知，通知内容包括以下要点：

555定时器的高触发端有效，输出

A. 置0
B. 置1
C. 不定