保龄球起初叫九柱戏，起源于德国和荷兰，原先是一种什么活动？
参考答案：
原先是宗教礼仪活动。
No conclusion _________ about the new product until the result of the experiment has been announced.
A．is drawn
B．was drawn
C．will be drawn
D．has been drawn
10米3池容的沼气池每天能产多少沼气？可满足多少人使用？
