血吸虫成虫卵寄生在（）
A、肝脏
B、静脉
C、门静脉和肠系膜静脉内
D、肠道内
参考答案：C
– How wonderfully you are playing the piano! do you practice it a week?
- Twice. Practice makes perfect.
A. How often B. How many times C. How soon
w性心理障碍
