— Today the forests are getting fewer and fewer — We must down too many treesA. keep peo

问题补充：

— Today the forests are getting fewer and fewer,

— We must down too many trees

A. keep people from cutting

B. prevent people from cutting

C. stop people from cutting

D. all the above

答案：

A. keep people from cutting

B. prevent people from cutting

C. stop people from cutting

(答案→)D. all the above

解析：keep people from cutting防止人们砍伐；prevent people from cutting 阻止人们砍伐；stop people from cutting阻止人们砍伐；all the above上面都是。句意：今天森林变得越来越少了。——我们必须防止人们砍伐更多的树木。结合语境可知选D。