在一段公路的两边栽树,每隔3米栽一棵,一共栽了600棵.这段公路一共长多少米?
(600÷2-1)×3,
=(300-1)×3,
=299×3,
=897(米),
答:公路长897米.
换位思考就是只替别人着想,不为自己着想。( )
_______ you have been to America for many times, you must know something about this country. [ ]
A. Since
B. Although
C. Unless
D. When