当利用大小为N的一维数组顺序存储一个栈时,假定用top==N表示空栈,栈元素由后向前进行顺序存储,则向这个栈插入一个元素时,首先应执行()语句修改top指针。
A. top++
B. top--
C. top=0
D. top
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There are five short dialogues about sharing on social media. Listen carefully, and choose the best answer to the question.[音频]Q: How often does the woman share her photos on social media?
A. Every day.
B. Every two days.
C. Every week.
D. Every month.
Q: What social media App does the woman use to share information?
A. WhatsApp.
B. Twitter.
C. WeChat.
D. Weibo.
Q: What does the man do on social media?
A. Watches videos.
B. Reads novels.
C. Reads information.
D. Chats.
Q: Why does the man like Weibo?
A. He likes to read different perspectives.
B. He likes to disagree with ideas on Weibo.
C. He likes to post ideas on Weibo.
D. He likes to post pictures on Weibo.