下列几类物质中对维持体内钙的平衡有重要意义的是（）。A.维生素D B.甲状旁腺素 C

Two farmers were on their way home one evening after a hard day's work．Both were tired．They happened to look up at the sky and saw a black cloud overhead．

"Ah!" said one farmer, "tomorrow we shall have rain and the rice will grow well．" The second answered, "Nonsense （胡说）, the rain will only kill the crops （庄稼）．"

So they began to fight．Just then a third farmer came along and asked them why they were quarreling（争吵）．Both farmers explained about the black cloud．

"What cloud?" asked the third farmer．They all looked at the sky．The cloud was no longer there．

小题1:The two farmers were _____．

A．going home

B．going to the field

C．going to work

D．going to see their friend小题2:The two farmers _____ on that day．

A．had a holiday

B．didn't work

C．worked hard

D．wanted to fight with each other小题3:According to the passage, when there are black clouds in the sky, the two farmers think _____．

A．it will rain soon

B．it will be fine

C．it will get hot

D．the sun is shining brightly小题4:The two farmers fought because _____．

A．they were hungry

B．it rained

C．one said the rain would do good to the crops and the other didn't think so

D．they both hoped for rain小题5:The third farmer came and said to the other two．He _____．

A．wanted to make friends with them

B．joined them in the quarrel

C．wanted to know why they were fighting

D．had nothings to do

《敬告青年》提出六方面要求？

如图1所示，下面的瓶子里装有红棕色的二氧化氮气体，且它的密度大于空气的密度，当抽去玻璃板后，过一段时间，看到上面瓶子里也出现了红棕色的二氧化氮，这是发生了            现象，它说明了分子在            ．而图2中的压缩引火仪，用力快速下按活塞，则看到棉花            现象，这是因为活塞对              做功，使其内能增大，温度              ，达到燃点．   

试述对生活方式指导效果的评估？

阅读以下相关的说明，根据要求回答问题1～问题3。
[说明]
系统集成商Y公司承担了某游戏软件开发项目的研发工作，Y公司任命庞工为项目经理。该游戏软件开发项目的各项工作的名称、工作持续时间、所需人力资源类型及其相应的工作量估计见表4-11。