乙烯的沸点是（）（常压）。 A.-47.7℃ B.-12℃ C.-103.7℃ D.

Dear Linda,

I’m glad to hear from you and I would like to be your pen friend. In your letter, you said you wanted to know something about my school life(生活).

I walk to school at 7:30 every morning because the school is near our house. When I get to school at about 7:45, I often do the cleaning with my classmates. After that we do some reading for half an hour. We have four lessons in the morning. I often have my lunch at 12:00 at school. We usually have two lessons in the afternoon. The school is over at about 5:00 and then I go home.

My favorite subject is Chinese. I like all the teachers because they are friendly. I am keen on sports and I enjoy playing football best. I’m a member of our school football team. What about your school life?

Best wishes!

Dick

小题1:It often takes Dick about _____ to walk to school every morning.

A．half an hour

B．15 minutes(分钟)

C．10 minutes

D．5 minutes小题2:After Dick gets to school, he _____ first.

A．does morning exercises

B．does some reading

C．has classes

D．does the cleaning小题3:How many classes does Dick usually have in a day?

A．Two.

B．Four.

C．Six.

D．Eight.小题4:How does Dick probably(可能地) go home?

A．On foot.

B．By bike.

C．By bus.

D．In Linda’s car.小题5:From the passage，we know that_____ .

A．Dick goes to school at 12:00 at noon

B．Dick doesn’t like studying Chinese

C．Dick’s favourite sport is playing football

D．Dick’s Chinese teacher is not friendly to him

Ⅰ、（4分）如图甲所示，在探究加速度与力、质量的关系的实验中，用装有沙子的小桶通过细线绕过定滑轮拉着小车在长木板上作匀加速直线运动，通过改变沙的质量的办法来改变小车受到的作用力F。用打点计时器打出的纸带测出小车的加速度a，得出若干组F和a的数据，然后根据测得的数据作出如图乙所示的a-F图线，发现图线既不过原点又不是直线，其可能的原因是____________。

A．没有平衡摩擦力，且小车质量较小

B．平衡摩擦力时，长木板的右端垫得过高，且小车的质量较大．

C．平衡摩擦力时，长木板的右端垫得过高，且沙子和小桶的质量较大

D．平衡摩擦力时，长木板的右端垫得过低，且沙子和小桶的质量较大

Ⅱ、（4分）在研究平抛运动的实验中，某同学用一张印有小方格的纸记录轨迹，小方格的边长为L．小球在平抛运动途中的几个位置如图中的a、b、c、d所示，则小球平抛初速度的计算式为v₀大小为＝         ；小球经过c点时的速度V_C大小为______  _____（均用L、g表示）．

Ⅲ、(10分)某电流表mA的量程为I₀=50mA，内阻为r₀=50Ω，其表盘刻度线已模糊不清，要重新通过测量来刻画出从零到满刻度的刻度值，有下列器材：

A.待测电流表mA     

B.6V直流电源E     

C.“0～10Ω，1A”标准变阻器R₁ 

D.“0～100Ω，50mA”滑动变阻器R₂  

E.“0.6A，0.5Ω”标准电流表A₁              

F.“3A，0.01Ω” 标准电流表A₂   

G.5Ω定值电阻R₃        

H.20Ω定值电阻R₄     

I.开关及导线若干

（1）应选用的器材有         (只需填写所选器材序号) 

（2）在右侧虚线框内画出实验电路图. 

（3）待测电流表的电流刻度值的表达式I=       . 式中各物理量所表示的意义分别为    .

“民为邦本”的价值理念中认为国家的根本在于（）。

A、军事

B、农业

C、民众

D、经济

按照《中华人民共和国环境保护法》规定：新建工业企业和现有工业企业的技术改造，应当采用资源利用率高、污染物排放量少的设备和工艺，采用( )的废弃物综合利用技术和污染物处理技术。

A．先进
B．高效
C．经济
D．经济合理

管道压浆料的凝结时间必须满足：初凝≥4h，终凝≤（）。

A、20h

B、24h

C、28h