计算（2y﹣x）（2y+x）的结果是
[ ]
A．4y﹣x
B．4y+x
C．4y2﹣x2
D．2y2﹣x2
答案：C
Then I got up slowly, looking at ______ moon, and lost in ______ thought, which made me sad.
A．the; \
B．\; the
C．the; the
D．\; \
应用大量抗生素药物输液治疗（）
A.急性宫颈炎
B.前庭大腺炎
C.慢性宫颈炎
D.急性盆腔炎
E.慢性盆腔炎
