下列药物中，其反式异构体有效，而顺式异构体无效的是
A．双炔失碳酯
B．黄体酮
C．米非司酮
D．己烯雌酚
E．左炔诺孕酮
参考答案：D
The three-year-old girl’s behaving _____ at the table surprised all the other guests and won her a lot of kisses.
A．normally
B．abruptly
C．apparently
D．properly
