450与400的差除它们的和，商是多少的正确列式是（ ） A．450+400÷（

遵守实验室规则，学习基本的实验操作方法，是实验成功的重要保证。下列实验操作错误的是

A．检查装置的气密性

B．液体的量取

C．液体的加热

D．稀释浓硫酸。

控制性降压期间，应避免（）

A.MAP低于80mmHg

B.头高脚低位

C.麻醉适度

D.动脉二氧化碳分压低于25mmHg

E.应用β受体阻滞药

补全对话。

A: Hello, Li Lei. Why didn't you come to the picnic yesterday?

B: My pen friend Qiu Tian came to see me.

A: Qiu Tian? What a nice name! (1)_______________?

B: He's quite good, helpful and honest. He does well in his lessons. We're getting on well with each other.

A: So you have the same interests?

B: Yes, he likes swimming, and so do I. Also, we both like computers, music and collecting.

A: That sounds great. (2)_______________?

B: He's handsome, tall and strong. Easy to get on with.?

A: (3)_______________ when he comes next time?

B: No problem. My friend is your friend. By the way, I heard your father was not well.

    (4)_______________? How is he?

A: His left leg was hurt in a car accident. Nothing serious now. He's much better.

B: (5)_______________. I hope he'll be better soon.

A: Thank you.

下列四种生活现象中，与其他三种有本质区别的是[ ]

A．

B．

C．

D．

请根据所学的人体生理知识，回答下列问题：（10分）

(1)人饮酒后酒精进入人体，主要被消化系统最膨大的器官    和小肠吸收，随着血液循环输送到人体最大的消化腺____，使酒精分解，长期饮酒对该器官伤害最大。

(2）足球运动员在比赛时大汗淋漓，以汗液形式排出体内的一些代谢废物。除此之外，人体还具有＿＿和＿＿两条排泄途径。

(3）足球运动员剧烈的运动需要大量的氧气，外界氧气进入表演者组织细胞需经过的过程是：肺泡与外界的气体交换、＿＿＿＿＿、氧气在血液中的运输、＿＿＿＿＿。

(4）人体出现炎症时，血液中白细胞的数量会明显增多，因为白细胞具有         作用

（5）义务献血时，用止血带结扎上臂后,使前臂血管隆起的结构是           ；为病人输血时应以输             为原则。

（6）正常人尿液与原尿相比不含葡萄糖的原因是                         。