焙烧炉风帽阻力测试时较为合适的压降约为（）
A、1~2KPa
B、2~3KPa
C、3~3.8KPa
D、3.8~4.5KPa
参考答案：D
When Mr. Smith retired, his son ______ the business from him. [ ]
A. took out
B. took down
C. took in
D. took over
常见的彩叶冬青科树种有（），（）。
