下列各项，可使子宫内膜由增殖期变为分泌期的激素是（）
A.促性腺激素释放激素
B.孕激素
C.雌激素
D.黄体生成素
E.促卵泡激素
参考答案：B
句型转换.
1. Did you decide on going on a field trip?(改为同义句)
Did you decide ____ ____ a field trip?
2. We enjoyed ourselves in the zoo of Beijing. (改为同义句)
We ____ ____ in the zoo of Beijing.
3. I think he must be a teacher, ____ ____?(完成反义疑问句)
4. We don't know the way, so let's see the map of Beijing. (改为同义句)
We don't know the way, so we ____ ____ see the map of Beijing.
5. We spent one and a half hours finishing this notice. (改为同义句)
We spent one ____ and a ____ finishing this notice.
下列选项中影响制碱塔内NaHCO3成核速率的因素不包括（）。
A、温度
B、杂质
C、压力
D、过饱和度
