患者，男，45岁。自觉心慌心烦，时息时作，健忘失眠。治疗应首选
A．三阴交B．神门C．足三里D．太溪E．合谷
参考答案：B
何谓蛋白质的等电点（pI）？
The more one is _______ the English-speaking environment, the better he or she will learn the language.
A．filled in
B．exposed to
C．caught on
D．kept up
