Grandpa is old but he is still very .A. livingB. aliveC. strongD. younger

问题补充：

Grandpa is old, but he is still very .

A. living

B. alive

C. strong

D. younger

答案：

A. living

(答案→)B. alive

C. strong

D. younger

解析： alive此处意思是“有活力”。