我正在使用Knit PDF在RStudio中编译beamer演示文稿。
---
title: "A.P. Statistics"
author: "Notes for Chapter 3.Rmd"
date: "Monday, October 13, 2014"
output: beamer_presentation
---
## Computer Output
```{r}
summary(lm(cars$dist~cars$speed))
```
如何更改字体大小(只针对这个块,保持其他块的相同字体大小),以便此命令的输出适合一页幻灯片?