人群中哪种咀嚼类型最多见（）
A.双侧同时咀嚼
B.侧交替咀嚼
C.右侧咀嚼
D.左侧咀嚼
E.后牙咀嚼
参考答案：B
不等式2x-4>0的解集是（ ）。
Jane is a nurse in the hospital, ________ she learned in a local medical school.
A．after that
B．after which
C．before that
D．before which
