下列反应在210℃达到平衡：

PCl₅（g）═PCl₃（g）+Cl₂（g）△H＞0      K=1            ①

CO（g）+Cl₂（g）═COCl₂（g）△H＜0      K=5×10⁴       ②

COCl₂（g）═CO（g）+Cl₂（g）△H＞0③

（1）化学平衡常数K表示可逆反应的进行程度，K值越大，表示____ ，K值大小与温度的关系是：温度升高，K值____ （填一定增大、一定减小、或可能增大也可能减小）．

（2）根据反应①的平衡常数K的表达式，平衡时，下列等式必定成立的是____ 

A．c（PCl₅）=c（PCl₃）=c（Cl₂）=1

B．c（PCl₅）=c（PCl₃）•c（Cl₂）=1

C．c（PCl₅）=c（PCl₃）•c（Cl₂）

反应②和反应③的K值表达式____ （填“相同”或“不同”）

（3）降低Cl₂浓度，反应③的K值____ （填“增大”、“减少”或“不变”）

（4）要使反应①和反应②的K值相等，应采取的措施是____ 

A．反应①、反应②同时升高温度

B．反应①、反应②同时降低温度

C．反应①降低温度，反应②维持210℃

给下面的文段选择标题，最恰当的一项是(　　)
      谈及教育孩子，前有“狼爸”“虎妈”，今又有个“鹰爸”。近日，一段4岁“裸跑弟”的视频被放到网上，迅速引来了网民关注，点击率有26万多次。视频里，美国纽约零下13 ℃的暴雪中，一名来自南京的4岁幼童，在“鹰爸”的要求下裸跑。“裸跑弟”一边跑，一边带着哭腔跟爸爸说话。教师出身的“鹰爸”表示，孩子是早产儿，曾被诊断可能痴呆，但经过自己的极限训练，孩子的智商潜力已高达218。对于这种极限教育方式，网友议论纷纷，褒贬不一。有医生指出，极端训练方法对智力的发展没有作用。有儿保专家说，循序渐进的“冻一冻”有好处。

    A rainforest is an area ____ (cover) by tall trees with the total high rainfall spreading quite equally through the year. Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate.____the forest cover, these areas would reflect more heat into the atmosphere,____ (warm) the rest of the world. Losing the rainforests may also influence wind and rainfall patterns, potentially causing certain natural disasters all over the world.

    In the past hundred years, humans ____ (begin) destroying rainforests in search of three major resources: land for crops, wood for paper and other products, land for raising farm ____ (animal). This action affects the environment as a whole. For example, a lot of carbon dioxide in the air comes from burning the rainforests. People____ (obvious) have a need for the resources we gain from cutting trees____ we will suffer much more than we will benefit.

    Rainforests are often called the world's drug store. More than 25% of the medicines we use today come from plants in rainforests. However, fewer than 1% of rainforest plants have been examined for their____ (medicine) value. It is extremely likely ____ our best chance to cure diseases____ (lie) somewhere in the world's shrinking rainforests.

下列过程不包含化学变化的是（   ）