单项选择题 高聚物改性沥青防水卷材属于（ ）。A. 刚性防水B. 柔性防水C. 综合防水###SXB##

未知题型 In the passage, 'screening' (Line 1, Para. 3) refers to______.A．testing employees for illnessB．revealing something that hidesC．checking on potential employeesD．conducting online researches

未知题型 Social networks websites are used by many employers because the former______.A．help reveal what kind of person an job candidate isB．can spread the information of the company in a fast wayC．save companies lots of money on communicationD．help improve employer-employee relationship