(),时矫首而遐观,(),鸟倦飞而知还,(陶渊明《归去来兮辞》)
参考答案:策扶老以流憩;云无心以出岫
--- Why on earth didn’t you answer the door?
--- I’m terribly sorry, but the telephone _______, too.
A.is ringing
B.was ringing
C.rang
D.was about to ring
人口承载能力乐观论认为现在的环境污染和退化都是暂时的。