问题补充:
Many of the earth’s plants and animals have already and several other species are endangered.
A. died away
B. died out
C. died down
D. died of
答案:
A. died away
(答案→)B. died out
C. died down
D. died of
解析:短语辨析。 A.消失 B.灭绝 C.逐渐消失D.死于。句意:地球上的许多动物和指物已经灭绝,一些其它物种濒临灭绝。故选B。