当Intel 8251A工作在同步方式时，引脚同步检测SYNDET可作为输入或输出信号使用。若工作在外同步方式，该引脚为______；若工作在内同步方式，该引脚为______。
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"Take pan of the Science Center home with you" means that______.
A. [A] visitors can buy something there and take them home
B. the Science Center may be sold to visitors
C. the visitors can make the Science Center their home
家电下乡政策实施一段时间以来，取得了很大成效，也存在一些问题。请根据材料内容，起草一份情况综述，供领导同志参阅。 要求：全面准确，内容充实，措辞严谨，不得完全照搬原文，字数在1000字以内。
Whom did Mr. Black buy presents for
A. His boss.
B. The son of his boss.
C. Mr. Black’s wife.
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