主要由胎儿胎盘单位合成的激素是（）
A.黄体酮
B.睾酮
C.雌三醇
D.雌二醇
E.雌酮
参考答案：C
If they win the final tonight, the team are going to tour around the city ________ by their enthusiastic
supporters.[ ]
A. being cheered
B. be cheered
C. to be cheered
D. were cheered
既可在喷洒过程中起到快速灭蝇的作用，又可保持长期灭蝇效果的方法是（）
A.超低容量喷洒
B.滞留性喷洒
C.常量喷洒
D.毒饵
