The moon is the ___ to the earth. [ ]
A. closed
B. near
C. nearest
D. close
答案:C
It was said ______ was all ______ he said.
A.that that; that
B.that that; what
C.which it; that
D.that what; that
( )是一种最常见的窒息性气体,在煤气的使用过程中,如果产生此种气体过多,就会中毒。
A.二氧化氮
B.一氧化碳
C.氧气
D.氨气