静息状态下K+由细胞内向膜外扩散属于
A．单纯扩散 B．载体中介的易化扩散 C．通道中介的易化扩散 D．主动转运 E．出胞
参考答案：C
研究疾病的年龄分布有：①横断面分析、②出生队列分析两种方法。前者主要用于（）病，后者主要用于（）。
—What do you think of the concert —I really enjoy it. I didn't expect it was ______ wonderful.
A. as B. moreC. most D. very
