卵巢上皮性肿瘤发病的高危因素包括()
A.遗传因素
B.HPV感染
C.环境因素
D.内分泌因素
E.持续排卵
参考答案:A, C, D, E
用所给单词的适当形式填空。
1. He often ______(get) up early.
2. ______(be) there a bank near the video store?
3. I met two _______(Canada) cousins in China.
4. I can't _______(find) my backpack.
5. Could you go _______(shop) with me?
植物细胞壁主要分为()。
A.初生壁
B.次生壁
C.药室内壁
D.胞间层