针灸抗衰老的治则（）。
A.只针不灸
B.针灸并用
C.只灸不针
D.泻法
E.补法
参考答案：B, E
解析：抗衰老宜针宜灸，补法。
John _______ at his uncle’s for 3 days and he is now at home.
A．stayed
B．has stayed
C．had stayed
D．was staying
CO2的同化
