下列哪项激素在一个卵巢周期中出现二次分泌高峰
A．雌激素B．LHC．雄激素D．孕激素E．FSH
参考答案：A
They usually get there a little _____ than we _____. [ ]
A. earlier; did
B. earlier; do
C. earlier; get
D. more early; do
生油层中含有大量的有机质及丰富的生物化石。
