项目工作是指为创造一个独特的产品、服务或结果进行的（）工作
A、部分
B、永久性
C、临时性
D、多次性
参考答案：C
The reason _____ he failed the exam was that he spent more time playing and less time learning. [ ]
A. because
B. that
C. why
D. which
我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过（）
A.1%
B.1.5%
C.2%
D.2.5%
