我国第一个五年计划的基本任务是集中主要力量发展（   ）

    It's a fine day today. The children are playing with their toys.

    Amy has a new plastic cup. It's red. Mike has a new toy truck. It's purple and green. Sarah has a lollipop. It's orange. John has a new bucket. It's green. Bob has a yellow balloon, it's nice.

    Mike and Bob are sharing their toys with others. How happy they are!

根据短文内容，判断正误。

中共八大提出党和人民的主要任务是（    ）

气温0℃层出现的高度是大气探测的一个重要高度，其变化能较好的反映当地区域气候变化特征．研究发现，天山夏季0℃层平均高度与河流年径流量变化具有较好的一致性，尤其是1990年以来，两者的变化更趋一致．如图是“天山山区夏季0℃层高度与河流径流量关系图”．读图回答下题．