整型变量占内存单元数为()
A. 1
B. 2
C. 3
D. 4
AT89C51单片机有4个P口，分别是：
A. P0、P1、P2、P3
B. P1、P2、P3、P4
C. PA、PB、PC、PD
D. A、B、C、D
The author stopped at a village on his way because he wanted to ____.
A. have his car repaired
B. enjoy the beautiful scenery
C. look for some bananas to fix his radiator
D. talk to some villagers to learn about their way of life
What's the author's reaction to the man's remarks on the center of the earth?
A. He thought the man was serious about what he said.
B. He thought that the man was telling the truth.
C. He thought that the man was telling a story.
D. He thought the man was making fun of him.
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