照样子，写一写。
说说（说一说） 读读（ ） 笑笑（ ） 走走（ ）
读一读 笑一笑 走一走
Great changes have taken place in that village. It is no longer ____ it was 10 years ago, ____ it was so poor.
A．what; when
B．that; which
C．what; which
D．which; that
使用离心式机油滤清器的柴油机，一般离心滤清器的机油流量只占柴油机机油总循环量的（）。
A.10/～2%
B.50%～80%
C.5%～8%
D.100%
