The ______ of living areas makes wild animals become fewer than before.
A:loss
B:lost
C:losing
D:lose
世界上最长的山脉是( )
我国很早就有人掌握了养蚕、编织丝绸等技术。其中有一道工序是将蚕茧用热水浸泡后缫丝,此时茧内的家蚕发育到哪一阶段 ( )