担保合同在( )时发生法律效力。
A．担保合同签订生效B．担保合同不完全履行C．被担保合同签订生效D．被担保合同不完全履行
参考答案：D
—Do you like cooking, Sally?
—________. Luckily I've never had to worry about it.[ ]
A. Never mind
B. Not really
C. I don't agree
D. You said it
伤寒的主要传播途径是（）。
A.经粪-口途径传播
B.母婴传播
C.血液传播
D.日常生活接触传播
E.经空气传播
