脑疝致命的原因是哪种（）
A.脑干受压
B.脊液循环障碍
C.小脑受压
D.颅内重要血管受压
E.大脑皮层受压
参考答案：A
When I was in trouble, my friends often ___ me a lot of help.
A．asked for
B．offered
C．needed
D．wanted
丁字着药
