减数分裂过程中，染色体数目减半发生在（）. A.前期I B.中期I C.后期I D.

阅读理解。

     A man with a green bag walked into a doctor's room. "Please sit down. Open your mouth and put out

your tongue," the doctor said. "Ok. You can close your mouth now. It is clear something is wrong with

you. You have to do more exercise." "But, doctor", the man said. "I don't think…" "Don't tell me what you

think," the doctor said." I am the doctor, not you. I know what you need. I see hundreds of people like you.

None of them get any exercise. They sit in offices all day and in front of the TV in the evening. What you

need is to walk quickly for at least 30 minutes a day." "Doctor, you don't understand," the man said. "I…."

"I don't want to hear any excuses," the doctor said. "You must find it time for exercise. If you don't, you

will get fat and have health problems when you are older." "But I walk every day" the man said. "oh, yes,

and I know what kind of walking that is. You walk a few meters to the train station from your house, a few

more meters from the station to your office, and a few more meters from your office to a restaurant for

lunch and back." "Please listen to me," the man shouted, getting angry." I am a mailman," the man continued.

"I walk for seven hours every day and I come to send letters." For a moment, the doctor said nothing, and

then he said slowly, "Put out your tongue again, will you?"

1. What's the color of the man's bag? [ ]

A. Black

B. Green

C. Blue

D. Yellow

2. What did the doctor ask the man first to do when he came in? [ ]

A. To put down his bag

B. To sit down

C. To open his mouth

D. To close his mouth

3. The doctor thought           . [ ]

A. the man was too fat and too old

B. the man was lazy and ate too much

C. there was nothing wrong with the man

D. most of his patients needed enough exercise

4. The mailman sends letters            every day.[ ]

A. on foot

B. by bike

C. by car

D. by bus

5. Which of the following is true? [ ]

A. The doctor do exercise every day

B. The man walked a long way to the station

C. The man got angry with the doctor

D. The doctor gave the mailman some medicine

将1 mol CO和2 mol H₂充入一容积为1L的密闭容器中，分别在250°C、T°C下发生反应_:CO(g)+2H₂(g)＝CH₃OH(g)，ΔH="a" kJ/mol,如图。下列分析中正确的是

A．250°C时，0〜10minH₂反应速率为 0.015 mol,/(L.min)

B．平衡时CO的转化率：T℃时小于250℃时

C．其他条件不变，若减小容积体积，CO体积分数增大

D．a<0,平衡常数K:T⁰C时大于250⁰C

巴氏消毒会影响牛奶中的（）

A.蛋白质

B.脂肪

C.维生素C

D.钙

E.乳糖

阻生牙拔除时可能遇到的阻力中，哪项可除外（）

A．邻牙阻力

B．对牙阻力

C．冠部骨阻力

D．软组织阻力

E．根部骨阻力

下列关于肝的描述，错误的是

A．大部分位于右季肋部和上腹部
B．肝后部邻接右肾和右肾上腺
C．肝有双重血液供应
D．肝门处有肝固有动脉、门静脉、神经、淋巴管出入
E．肝膈面有胆囊窝