用显微镜观察草履虫时，看到虫体内的食物泡是 [ ]

A．大小相等，数量两个

B．大小相等，数量多个

C．大小不等，数量两个

D．大小不等'数量多个

My brother is not in very good shape, so he has _____ tennis to get fit.  [ ]

A. made up

B. built up

C. taken up

D. held up