颅腔内容物包括（ ）
A．脑组织
B．垂体
C．血管
D．脑脊液
E．血液
参考答案：A,D,E
— Can I pay the bill by check?
— Sorry, sir. But it is the management rules of our hotel that payment ______ be made in cash. [ ]
A. can
B. shall
C. will
D. may
简述活动课程理论发展概说
