在力学理论建立的过程中，有许多伟大的科学家做出了贡献．关于科学家和他们的贡献，下

一天，小华对学校综合楼的电梯运行情况进行了测量，电梯由静止开始匀加速上升，经4s速度达到2m/s后，开始以这一速度匀速上升6s，然后匀减速上升3s后停在六楼，求小华此次测量过程中，电梯上升的高度？

血源性肺脓肿的诊断依据（）。

A.高热不退、咳嗽、咳痰等症状

B.有皮肤创伤感染、疖痈等化脓性病灶

C.肺部纤维化

D.静脉吸毒者患心内膜炎

E.X线胸片显示两肺多发性肺脓肿

PhotoshopCS3中，在规则选择工具中使用“( )”组合键可以在“矩形”选择工具和“椭圆形”选择工具中切换。

A．Shift+P

B．Shift+M

C．Ctrl+P

D．Ctrl+M

I still remember the last time I went to the playground with two of my children. It had rained during the night and the playground was very muddy (泥泞的). They had just put on clean clothes, so I was a little worried about the mud on the playground. It was not long before Kathy got her beautiful skirt dirty on the playground. She dug through the rocks. I was about to blame (指责) her for getting her clothes dirty when she ran towards me with a smile on her face. When she got to me, she handed me a little heart-shaped rock and said, “Here, Mom! Here is a heart for you —just because I love you! Keep it!” With tears in my eyes, I thanked her.

Should I blame her for getting her clothes muddy? No way! I still have that little heart-shaped rock. It is one of the best gifts that I have ever received. I realized that many times it was not necessary for us adults to worry about the small things our children did. Let them do what they’d like to.

I will spend a lot more time on the playground with my children. I’m sure I will learn a lot from them. It makes me think of the days when my grandfather told me, “You would not enter the kingdom of happiness until you pretended (假装) to be a small child.”

小题1:At first, the author wanted to blame Kathy because she __________.

A．ran on the playground

B．dug through rocks

C．gave her a muddy rock

D．got her clothes dirty小题2:The author was deeply moved by her daughter’s _____.

A．digging task on the playground

B．special way to show her love

C．smile on her face when running

D．love of the muddy playground小题3:From Paragraph 2, we can learn that the author thought parents should _________.

A．not worry about the small things their children do

B．allow kids to do whatever they like

C．keep the presents given by children

D．not give too much care to their own children小题4:The author’s grandfather’s words imply that _______.

A．children care more about happiness than adults

B．adults can not share children’s happiness

C．children may find happiness more easily in life

D．adults find it hard to know children’s happiness

与缴纳碳排放税相比，工业界更愿意参与碳汇交易。不仅在碳汇交易的规则制定上，工业界往往有较大的发言权，而且还可以通过投资或技术创新，减少支出，甚至通过交易盈利。因此在工业界的游说下，碳汇交易经常成为一项商业活动，其降低碳排放的本意往往被大大削弱。欧盟将于2012年实施航空业“碳排放封顶加交易”计划，其实已经对航空企业做出了很大让步，但这是世界上首次对航空业的碳排放实施监督，算是走出了艰难的第一步。然而因为这项碳汇交易计划覆盖了飞往欧洲的所有航班，依然受到了美国航空业的指责。
对本段文字主旨概括最准确的一项是( )。

A．工业界更愿意参与碳汇交易
B．碳汇交易可以使工业界获益匪浅
C．通过碳汇交易降低碳排放困难重重
D．“碳排放封顶加交易”对于降低碳排放意义重大