关于艾灸的补泻，古人认为，施灸时“勿吹其火，须自灭也”为艾灸之______法。
参考答案：补
在下列系统中，最具有生物多样性的生态系统是[ ]
A．森林生态系统
B．草原生态系统
C．湿地生态系统
D．城市生态系统
On a purchase of $120， a store offered a payment plan consisting of a $20 down payment and 12 monthly payments of $10 each. What percent of the purchase price， to the nearest tenth of a percent, did the customer pay in interest by using this plan ？（）
A.16.7%
B.30%
C.75.8%
D.106.7%
E.107.5%
