作为机体生长、发育和生殖的主要物质基础是A．液 B．气血 C．水谷之精 D．肾所藏之

对碘缺乏的理解哪个是错误的（）

A.即缺碘

B.自然环境碘水平低于标准时称外环境碘缺乏

C.人体内碘营养不足称为内环境碘缺乏

D.以上均对

E.以上均不对

有几位同学讨论磁感线时有以下几种说法，你认为不正确的是

A．磁体周围越接近磁极的地方磁感线越密

B．磁感线并不存在，是一种假想的线

C．通电螺线管外部磁感线的方向是从S极到N北极

D．磁场中某点的磁场方向就是磁感线的切线方向

Katie always felt there had to be something more to life than just partying, buying clothes and driving a cool car. She finally discovered what she was missing out on when she traveled halfway around the world to help poor kids.

When she was 14, she discovered a club at school called Operation Smile, an organization that supports free operation for facially deformed kids in developing countries. At that time, she joined Operation Smile just to satisfy her school's community service requirement.

After working with Operation Smile for a while, she learned different countries have different deformities (畸形). The more she learned about what affects kids around the world, the more she wanted to go abroad with Operation Smile.

At 15, she was chosen to go abroad. She was so happy – even though she didn't realize what she was getting herself into. Before her trip, she attended a weekend "mission training". That's when she was told she'd be going to the Philippines. Although she was excited, one night during training, she broke down in tears. She didn't know if she was prepared to see all these unfortunate kids. She was put to work three days after her arrival in the Philippines. Her first day was at the hospital, where she met those kids waiting for operation, and they were running around and happy, it seemed normal. Her job was to play with the kids before their operation to help them feel more at ease. She also went to nearby schools to hand out toothbrushes and teach students how to brush their teeth.

When their operation was over, the kids were always overjoyed, but their parents were blown away. Sometimes they couldn't even recognize their kids because their appearances had improved so much. They'd cry and hug the doctors and nurses and give them presents--they were so grateful.

小题1:Why did the author join the Operation Smile?

A．To help poor kids in developing countries,

B．To satisfy her own curiosity.

C．To do what was required by the school.

D．To operate on those unfortunate kids.小题2:According to the passage, Operation Smile ____.

A．is a club popular with students

B．is an organization founded by students

C．helps those unfortunate kids learn how to smile

D．offers operation for those unfortunate kids free of charge小题3:Why did the author play with those kids in hospital?

A．To make them happy.

B．To learn more shout them.

C．To teach them how to brush their teeth.

D．To make them feel relaxed about the operation.小题4:After the operation, parents felt surprised for their kids' had improved so much.

A．health condition

B．looks

C．smile

D．mood

甲亢病人术前基础代谢率宜控制在()

A．+50%以下

B．+40%以下

C．+30%以下

D．+20%以下

E．+5%以下

正常成年人血红蛋白A的主要肽链结构是

A．α₂β₂
B．α₂γ₂
C．ζ₂β₂
D．α₂ε₂
E．ζ₂ε₂