公民身份号码是每个公民唯一的、终身不变的身份代码。

To Jim,

Hi, Jim. I’m a Chinese girl .My English name is Betty. I’m a student. I live in Nanjing with my parents. Nanjing is a big city in China. I like playing table tennis and running. I like listening to music, too . My favourite food is rice and fish. My dad is a doctor and my mum is a worker.

To Betty,

Hi, Betty. I’m a boy. My name is Jim Hand. I’m a student, too. I live in London with my parents and my sister. London is big , too. It’s in England. My sister likes reading books, but I like watching TV. She can type and write Chinese. I can draw and sing very well. My parents are both teachers.

小题1:Betty is a(an)         .

A．Chinese girl

B．English girl

C．Chinese teacher

D．English teacher小题2:The boy’s family name is           .

A．Green

B．Hand

C．Jim

D．Tom小题3:Betty’s favorite sport is           .

A．walking

B．playing football

C．listening to music

D．playing table tennis and running小题4:Who can write Chinese?

A．Jim

B．Betty

C．Jim’s sister

D．Betty’s father小题5:Jim’s mother is a          .

A．worker

B．doctor

C．secretary

D．teacher

病例对照研究与队列研究相比，优点是()

A．容易得到发病率指标

B．容易避免系统误差

C．容易验证病因假设

D．容易确定暴露与疾病的先后顺序

E．适用于罕见病的研究

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京东商城的商务模式(2分)。

装配质量的好坏直接影响到焊接工艺和产品质量。( )

石笼可在任何季节施工，以低水位期最为有利。