单价合同是指承包人按规定承担（）的风险。
A、工程量
B、质量
C、安全
D、报价
参考答案：D
If he ________ busy now, he would have much more time to do exercise.
[ ]
A. doesn't
B. isn't
C. weren't
D. won't be
原发性肝癌最易转移的脏器是（）
A.肝内
B.肺
C.骨
D.肾
E.胰腺周围和腹膜后
