我国出现佛光频率最高的地方是()。
A.庐山
B.黄山
C.武夷山
D.峨眉山
参考答案:D
What did you do last Sunday? We ______ many photos in the new park. [ ]
A. visited
B. built
C. took
D. gave
霍乱的发病机制中,起主要作用的是
A.侵袭力B.肠毒素C.神经节苷脂D.内毒素E.cAMP