A:质量好、价格低
B:接近中亚市场
C:科技投入大
D:机械化程度高
一 Many students don't know _____ stress and become worried.
一 I think they should communicate more with their parents.
下面为南美洲轮廓图及其相应气候资料和亚马孙河流域水系示意图,读图回答问题.