切断时，切断刀的刀头宽度和切入深度相等。( )

丁基橡胶可用于制造汽车内胎，合成丁基橡胶的一种单体A的分子式为C₄H₈，A氢化后得到2-甲基丙烷。完成下列填空：

（1）A可以聚合，写出A的两种聚合方式（以反应方程式表示）。

__________________、_________________

（2）A与某烷发生烷基化反应生成分子式为C₈H₁₈的物质B，B的一卤代物只有4种，且碳链不对称。写出B的结构简式。_________________

（3）写出将A通入下列两种溶液后出现的现象。

A通入溴水：_________________A通入溴的四氯化碳溶液：_________________

（4）烯烃和NBS作用，烯烃中与双键碳相邻碳原子上的一个氢原子被溴原子取代。分子式为C₄H₈的烃和NBS作用，得到的一溴代烯烃有_________种。

有以下程序
main ( )

int i,n=0;
for (i=2 ;i＜5;i++)

do

if (i%3) continue;
n++;
while(!i);
n++;

print f ( "n=%d\n" , n);

程序执行后的输出结果是

A．n=5

B．n=2

C．n=3

D．n=4

【1】 It's difficult enough to have privacy(隐私) in a house, so privacy in a small dorm room is next to impossible. However, it can be done if both roommates are willing to cooperate.

【2】 Step1  Tie a scarf to the outside doorknob as a symbol of Do Not Disturb, but be careful not to do this too consistently. Warn your roommate beforehand about possible days and times when this scarf will be on the door so your roommate will have time to make plans ahead of time instead of it being a surprise, especially if you plan to have an overnight guest. Be considerate if your roommate needs to get into the room regardless of the scarf on the door to get something out of the dorm because it is his dorm room too.

【3】 Step2  If one roommate is a light sleeper and the other is a heavy sleeper, the heavy sleeper could consider an alternate way to wake himself up besides an alarm. Heavy sleepers tend to ignore alarms, but sometimes vibrating (震动的) cell phones feel like someone is shaking them. It is also a quieter way to not disturb the light sleeping roommate using a vibrating cell phone.

【4】 Step3  Take cell phone calls outside of the room. Your roommate may not want to hear your conversation or you may want some privacy, but your roommate should not have to leave every time you have a phone call. The roommate who is not on the phone has no way of knowing how often you will have phone calls and should not be put out because you do.

【5】 Step4  Ask if it' s okay to have a guest in the room. Although your roommate is not your parent, and you may feel like this is your room too, remember that ____     . He may not want company when you do. If one roommate is more sociable than the other and guests become a repeated argument, consider asking the resident director if you can swap( 交换) roommate with someone else.

小题1:What does the passage mainly talk about? (no more than 10 words)

______________________________________________________________________

小题2:Complete the following statement with proper words, (no more than 6 words)

To avoid disturbing the light sleeper, _______________________ is also a good way.

小题3:Please fill in the blank in the passage with proper words, (no more than 6 words)

_________________________________________________________________

小题4:What does Step 3 suggest us? (no more than 10 words)

_______________________________________________

小题5:What does the underlined word "it" (line 2, paragraph 1) probably refer to? (no more than 3 words)

_______________________________________________

骨瘤好发于（）

A．短骨

B．长骨骨骺

C．长骨干骺端

D．长骨骨干

E．扁骨

发动机水冷却系节温器的作用是用来改变冷却水的循环路线及（）。