ⅰ.阅读理解
a
(2014•河南省六市联考)imagine you are on a cold mountain with steep rocks around.as you climb higher，the air gets thinner and the sun’s rays stronger.just before you reach the snowline，you find what you came for—a small white flower，the edelweiss(火绒草)，which only grows in alpine(高山的) areas.
plants face many challenges living in alpine areas，and only 200 kinds of plants can grow there.plants rely on oxygen，water，and sunlight to mak
