To make the world a nice place to live in, we should take ________ to protect the environment.[ ]

A. approaches  

B. means

C. warnings  

D. measures

国内生产的三相片避孕药含有的激素成分为

A．炔雌醇+去氧孕烯

B．炔雌醇+炔诺酮

C．炔雌醇+甲地孕酮

D．炔雌醇+左炔诺孕酮

E．炔雌醚+氯地孕酮