— How much does the toy ______ you?

— I buy it ______ 340 yuan. [ ]

A. spend, for

B. cost, with

C. pay, on

D. take, at

灌注模型时，如果振荡力量过大，可能会造成的不良后果是

A．出现气泡
B．影响石膏凝固
C．脱模
D．模型不清晰
E．基牙折断