对时

影响劳动力需求量的主导因素是（）。

A.劳动力供给量

B.劳动生产率

C.工资率

D.劳动力资源率

侧位观察寰椎的位置，一般寰椎前弓和齿状突前缘的距离为

A．成人不超过1mm，幼儿不超过3mm

B．成人不超过2mm，幼儿不超过4mm

C．成人不超过3mm，幼儿不超过5mm

D．成人不超过4mm，幼儿不超过6mm

E．成人不超过5mm，幼儿不超过7mm

B

The Young Can't Wait

By Severn Cullies Suzuki

When you are little, it's not hard to believe you can change the world. I remember my enthusiasm when, at the age of 12, I addressed the delegates at the Rio Earth Summit. “I am only a child,” I told them. “Yet I know that if all the money spent on war was spent on ending poverty（贫困） and finding environmental answers, what a wonderful place this would be. In school you teach us not to fight with others, to work things out, to respect others, to clean up our mess, not to hurt other creatures, to share, not to be greedy. Then why do you go out and do the thing you tell us not to do? You grown-ups say you love us, but I challenge you, please, to make your actions reflect（反省） your words.”

I spoke for six minutes and received a standing ovation. Some of the delegates even cried. I thought that maybe I had reached some of them, that my speech might actually spur（刺激） action. Now, a decade（十年） from Rio, after I've sat through many more conferences, I'm not sure what has been accomplished. My confidence in the people in power and in the power of an individual's voice to reach them has been deeply shaken.

When I was little, the world was simple. But as a young adult, I'm learning that as we have to make choices—education, career, lifestyle—life gets more and more complicated. We are beginning to feel pressure to produce and be successful. We are taught that economic growth is progress, but we aren't taught how to pursue a happy, healthy or sustainable way of living. And we are learning that what we wanted for the future when we were 12 was idealistic and naive.

Today I'm no longer a child, but I'm worried about what kind of environment my children will grow up in. I know change is possible, because I am changing, still figuring out what I think. I am still deciding how to live my life. The challenges are great, but if we accept individual responsibility and make sustainable choices, we will rise to the challenges, and we will become part of the positive tide of change.

60．The purpose of what the writer said at the age of 12 was to _______.

A．end poverty and make school beautiful

B．find environmental answers and keep the words that they always told themselves

C．end poverty and solve the problems about environment

D．find a wonderful place and clean it up

61．What does the underlined word “ovation” in the second paragraph refer to _____.

A．a long period of laughing              B．a warm welcome

C．an expression used for greeting      D．a long period of clapping and applause

62．It becomes clear that the writer is possibly _________ now.

A．in his teens      B．in his twenties  C．in his thirties    D．in his forties

主要承重构件全部采用钢筋混凝土结构的房屋称为钢筋混凝土建筑结构。

肺动脉瓣关闭不全最常见的病因是

A．感染性J乙内膜炎致肺动脉瓣穿孔
B．继发于肺动脉高压所致肺动脉扩张
C．肺动脉瓣病变如风湿性心脏病
D．特发性肺动脉扩张
E．梅毒性肺动脉炎致肺动脉根部扩张