如图所示，用A、B两把刻度尺测同一物体的长度，放置正确的是____ （填“A”或“B”）刻度尺，该刻度尺的分度值是____ ，被测物体的长度是____ cm．

已知$f_1\left(x\right)=x^{\frac{1}{2}},f_2\left(x\right)=x^2,f_3\left(x\right)=e^x,f_4\left(x\right)={\log }_{\frac{1}{2}}x$, 四个函数中,当$0<x_1<x_2$时, 满足不等式$\frac{f\left(x_1\right)+f\left(x_2\right)}{2}<f\left(\frac{x_1+x_2}{2}\right)$的是(      )

(____) 1. A. shine    B. ship      C. school     D. shop

(____) 2. A. book     B. cook      C. food       D. good

(____) 3. A. which    B. who       C. what       D. where

(____) 4. A. dress    B. drink     C. drive      D. tree

(____) 5. A. think    B. mouth     C. there      D. thank