It is pretty well understood_______ controls the flow of carbon dioxide in and out the atmosphere today.
第二部分:英语知识运用(共两节,满分45分)第一节 单项填空(共15小题;每小题1分,满分15分)从A,B,C,D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑.Mike ranked _____ first in track and fields and John got _____ first prizes in jumping.
______ along with host families, I believe, language travel students are likely to get enough language practice.
These interesting articles were written by Anna, who___for our magazine these years.
In time of war, different parties tend to ______ their political differences to fight against foreign invaders shoulder to shoulder.
Not far from the school there was a garden, ___owner seated in it playing chess with his little grandson every afternoon.