剖宫产病人首选的麻醉方法为()A．局部浸润麻醉 B．针刺麻醉 C．脊麻 D．硬膜外阻

阅读理解。

     Daniel has many friends. They look different and they have different personalities, but they are all

friendly and helpful. He’d like to introduce some of them to us.

1.How many friends does Bob introduce in this passage?

A. Two.           

B. Three.            

C. Four.              

D. Five.

2.What does Amy do?

A. She is a volleyball player.                

B. She is a skier.

C. She is a pop singer.                    

D. She is a basketball player.

3.Why do people say Tom is a "sunshine boy"?

A. Because he likes reading.                

B. Because he likes playing games.

C. Because he is always smiling.            

D. Because he is a skier.

4.Which of the following is not true about Millie?

A. She is very tall.                       

B. She wears black glasses.

C. She likes wearing a dress.                

D. She has short hair.

5.Which sentence is wrong?

A. "Baby" does well in playing basketball.          

B. Millie is the youngest of the three.

C. Amy has a baby face.                        

D. Tom likes black horses.

This new discovery of oil is of great ________ to this area's economy.[ ]

A. significance  

B. accuracy

C. satisfaction  

D. assumption

下列溶液中有关物质的量浓度关系和计算不正确的是  [ ]

A．pH相等的NaOH、CH₃COONa和NaHCO₃三种溶液，则有c(NaOH)< c(NaHCO₃)<c(CH₃COONa)

B．已知25℃时Ksp(AgCl)=1.8×10^-10，则在0.1mol·L^-1 AlCl₃溶液中，Ag⁺的物质的量浓度最大可达到6.0×10^-10 mol·L^-1

C．25℃时，0.1 mol·L^-1 Na₂CO₃溶液中水电离出来的OH^-浓度大于0.1 mol·L^-1 NaOH溶液中水电离出来的OH^-浓度

D．室温下，0.1mol·L^-1 NaHA溶液的pH=4，则有c(HA^-)>c(H⁺)>c(H₂A)> c(A^2- )

2，4-二硝基氟苯分光光度法测定空气中的异氰酸甲酯，配制吸收液时，将二甲基亚砜与0.10mol／L盐酸溶液等体积混合。