题干
Although my grandfather is in his eighties, he is still as ______ as a young man and hates sitting around doing
nothing all day.
A：enthusiastic
B：automatic
C：energetic
D：innocent
答案(点此获取答案解析）
C
，
是两条不同的直线，
是一个平面，则下列命题正确的是 （ ）