C语言程序能够在不同的操作系统下运行,这说明C语言具有很好的( ).
A. 适应性
B. 移植性
C. 兼容性
D. 操作性
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When you decline an invitation, you should always include ________.
A. time and place
B. a reason or an excuse
Which is a polite way to decline invitation?
A. No, I can't.
B. I'd love to.
C. I'd love to, but I have to do my homework. Maybe next time?
Match the words with correct definitions.
一篇论文最重要的价值在于：
A. 是否发布
B. 发表在什么刊物上
C. 是否具有学术价值
D. 是否具有参阅性
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