问题
单项选择题
对于8751单片机，当其引脚EA接低电平时，可扩展的外部程序存储器最大为（）。k字节。
A.64
B.60
C.32
D.16
答案
参考答案：A
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对于8751单片机，当其引脚EA接低电平时，可扩展的外部程序存储器最大为（）。k字节。
A.64
B.60
C.32
D.16
参考答案：A
| 完形填空。 | ||||
| Brandon Keefe was in the third grade when he decided to make a difference. One afternoon at a parent-teacher meeting to 1 building a library for a children's home, Brandon heard 2 difficult it was to get books. And he thought he might have a good 3 . Many people have books that they don't like to read any more, so 4 give those books to kids who need them? To help those kids who 5 . books to read, Brandon Keefe started an organization (组织)-Book Ends. The organization has 6 76 000 books to children in need, and built 23 7 . 19 more libraries are being built. 8 will help more than 33 000 poor kids. "So many people helped me do the work 9 the organization. And the reaction (反映) of the people we helped makes me work 10 to help more people," Brandon Keefe said. | ||||
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