—No, it is only three weeks ________ they married.
A:that; since
B:that; when
C:when; that
D:since; before
There were two children ahead, walking_______.( )
辽阔的____
A.视野
广阔的____
B.马路
宽阔的____
C.草原
开阔的____
D.天地
如图是膝跳反射示意图,请据图回答下列问题:
27的30倍是____, 16个30是____,270是9的____倍。