心包囊肿的最好发部位为（）
A.心底部
B.心尖部
C.右侧肋膈角
D.左侧肋膈角
E.心脏后方
参考答案：C
写出下列句子的复数形式。
1. This is a book.
_________________________
2. That is my parent.
3. Yes, it is.
4. What's this?
5. Is that your pencil?
To keep healthy, Professor Wade _ cycling as a regular form of exercise after he retired.[ ]
A. took up
B. picked up
C. carried out
D. took on
