Unit13TheworldspopulationLesson51课件

Revision Read and act Make sentences Practice Grammar slow down 放慢 Standing room only 立足之地 be born on the earth 在地球上出生 the increasing population 增长的人口 during the next hour 接下来的那个小时里 hour after hour 一小时接一小时 multiply…by… …乘以… the greatest challenge of，