黑子和耀斑所对应的太阳大气层分别是（　　）

我国新修订的《环境保护法》，使环境保护有了更严格的法律依据．

①为减少煤燃烧时二氧化硫的排放，对煤炭进行____处理（填专有名词），同时对燃煤的烟气进行____处理（填专有名词），防止造成雾霾天气．

②含铬元素的废水必须治理达标．某兴趣小组处理含Cr₂O₇^2﹣的废水的方法是用（NH₄）₂Fe（SO₄）₂将其还原为Cr³⁺，再用氨水将Cr³⁺转变成难溶的Cr（OH）₃．写出用氨水将Cr³⁺转变成难溶的Cr（OH）₃的离子方程式：____；该方案处理后的废水中因含有大量____元素，导致水体富营养化．

③将CO₂和H₂按物质的量1：4混合，在适当条件下反应可获得CH₄．写出该反应的化学方程式：____．

读短文，完成下面各题。

    Hello, my name is Li Ming. My birthday is June 9th. My mother's birthday is June 14th. My grandpa's birthday is June 23th.My grandpa is in America, my grandpa lives with my uncle Bill and aunt Mary in America, so I usually make an e-card to him for his birthday.

My grandma's birthday is in July, it is very hot and sunny in July, then when her birthday is coming, we often go swimming for her birthday.  

把4千克的糖溶于50千克的水中，糖水的含糖率为80％．

____直到……时候

指从过去某一点到从句所示的时间为止的一段时间。如：

By the time we got to his house, he had finished supper.

在我们到达他就已经吃完了晚饭。