天然圣诞树
参考答案:20(0604.9100)
— 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
60年代欧洲发生的反应停事件导致大量畸形胎儿出生,其主要畸形是()。
A.残肢畸形
B.神经系统畸形
C.心血管畸形
D.消化道畸形