填空题

It’s______(尝试和她谈是浪费时间)when she’s in this mood.

【参考答案】

a waste of time trying to talk to her

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单项选择题

What’s the main purpose of this passage（）

A. To make people pay more attention to libraries.
B. To introduce the World Digital Library clearly.
C. To arouse people’s awareness of protecting our culture.
D. To tell people how to take advantage of digital libraries.

填空题

Up to now, most ecologists have less globally focused on the factors which they think affect （）