营养繁殖的方法很多，常用的有扦插、（）、埋条、压条、根孽等。
A、嫁接
B、组织培养
C、克隆
参考答案：A
《巴塞尔新资本协议》引入了计量( )的内部评级法。
A．信用风险B．市场风险C．操作风险D．法律风险
—The Summer Palace is wonderful. Have you ever visited any other interesting places?
—Yes. Also, we _______ to the Great Wall. [ ]
A. have gone
B. have been
C. had gone
D. had been
