蛋白质的食物来源主要是（）、大豆及其制品。
A、鱼虾
B、肉
C、蛋
D、奶
参考答案：A, B, C, D
If the building project _____ by the end of this month is delayed, the construction company will be fined. [ ]
A. being completed
B. is completed
C. to be completed
D. completed
下列不属于阴阳学说基本内容的是
A．对立制约
B．生克乘侮
C．互根互用
D．消长平衡
E．相互转化
