电雷管必须由药卷的()装入,严禁用电雷管代替竹、木棍扎眼
A.底部
B.中部
C.顶部
参考答案:C
—We want to finish the task ahead of time.
—You have to _____________, if so.
A.speed it up
B.take it up
C.pick it up
D.turn it up
Mary has ______ orange and two bananas. [ ]
A. a
B. an
C. the
D. /