Pre-reading Activities: Listening First Listening: Before listening to the tape, have a quick look at the following words. greenhouse effect n.温室效应 alter . to make different. but without release carbon dioxide vt1. allow sth. to fly, fall freely释放 at free: allow to go排放 tropical md执带的 ecology global n. a way in which sth. happens, pattern moves, develops or is arranged Ⅴenus 几.金星 n温度计,寒暑表 thermometerPre-reading Activities: Listening greenhouse effect alter release carbon dioxide tropical ecology global pattern Venus thermometer First Listening: Before listening to the tape, have a quick look at the following words. n. 温室效应 v. to make different, but without changing into something else vt. 1. allow sth. to fly, fall freely 释放 2. set free; allow to go 排放 adj. 热带的 n. 二氧化碳 n. the relationships between living things and their surroundings 生态 adj. of or concerning the whole earth 全球的 n. a way in which sth. happens, moves, develops or is arranged n. 金星 n. 温度计，寒暑表