A:him; hers
B:him; her
C:his; her
D:his hers
将蛙的卵巢放入含有蛙脑垂体提取液的培养液中,同时检测某种激素的含量,经过一段时间培养后,再检测培养液中该激素的含量,发现该激素含量增加,这种激素是
The Great Wall has such great that thousands of tourists come to visit it every day.
你看到的心电图是( )