We are all aware _________ the many threats _________ the environment and we need to take action to prevent us from the bad consequences.

A．of; to

B．of; on

C．that; to

D．that; on

阅读下面宋词，回答问题。(6分)

浣溪沙

晏殊

一曲新词酒一杯。去年天气旧亭台。夕阳西下几时回?无可奈何花落去，似曾相识燕归来。小园香径独徘徊。

小题1:这首词表达了作者怎样的感情，结合全词简要概括。(3分)

小题2:“无可奈何花落去，似曾相识燕归来。”一向为词评家赞赏，请简要赏析。(3分)