填空题

When it comes to renewable resources, the most important topic is probably______.

【参考答案】

sustainable development
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单项选择题
A．Less than 30 minutes.B．From 30 to 45 minutes.C．At least 45 minutes.D．More than 30 minutes.
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C．At least 45 minutes.
D．More than 30 minutes.
填空题
Of those who have been infected with HIV, more than______ has contracted AIDS.
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