给马属动物作肠套叠整复术应行（）
A.左侧卧保定
B.右侧卧保定
C.俯卧保定
D.仰卧保定
E.六柱栏内站立保定
参考答案：B
During the reading lesson, the teacher asked students to read a few ______ from the novel.
A．pieces
B．essays
C．fragments
D．extracts
地下金属非金属矿山对矿井通风系统有何要求？
