A：
B：
C：
D：
It's good for people to walk more and drive less. So I'd rather _______ half an hour's walk to work.
把图3中各电路元件接成串联电路．
结结实实 ____、____、____
若隐若现 ____、____、____
成千上万 ____、____、____
欣欣向荣 ____、____、____
