正常控制可以是使变量保持在常数的定制调节，也可以使变量的跟踪变化的随动调节。

What is “Walk to school”?

Now we are working on a program of “walk to school”. We would like as many parents and children as possible to take part, even if in a small way. Children who walk to and from school along with their parents can learn essential(基本的) road safety and life skills.

You can take part by…

● Walking to and from school with your child every day.

● Walking for one or two days during the week.

● Encouraging others to walk, if you have already done.

Walking is great!

● Walking is great exercise! A walk is good for your body and can keep you fit.

● You won’t have to waste time looking for a parking site(停车点).

● It’s free. You’ll save money by not using the car.

● It’s pollution free.

● It’s a good chance to your children and to meet other parents, too.

Enjoying walking to school!

Here are some suggestions to help you and your child enjoy walking to school.

● Plan a safe route together.

● Teach children what a kerb(马路牙子) is and what it means.

● Encourage your child to help you choose the safest places to cross the road.

● Look at and discuss the things you see on your way—especially road signs and what they mean.

Walk to school! Thousands of parents and children have already taken part, could you?

Please go to WWW.walkschool.org.uk for more information.

小题1:“Walk to school” may be _________.

A．a relaxing advertisement

B．an interesting sign

C．a meaningful program

D．a colorful picture小题2:Who are encouraged to take part in Walking to school?

A．Parents and children

B．Drivers and workers.

C．Teachers and students.

D．Mothers and fathers.小题3:Walking to school can help you __________.

A．how to walk to school quickly

B．save time to get to school

C．draw some pictures of the kerb and road signs

D．learn essential road safely and life skills小题4:Which is NOT the benefit(好处) of walking to school?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

A．It can keep you fit.

B．It can save money.

C．It won’t pollute the air.

D．It can’t help you make new friends.小题5:According to the writer, you can learn more about “walk to school” by?

A．reading a newspaper

B．going to the Internet.

C．making a phone call

D．having a traffic lessons.

图中，能正确表示台风气压或气流状况的天气系统是   （   ）

一般认为，精神分裂症的阳性症状包括____________、__________、___________________、____________________。而阴性症状包括_______________，________________，_________________，______________，_______________。

研究人员先给甲口服某激素，给乙注射同种同量的激素，然后测试甲、乙两人的血糖浓度值，并绘制成曲线图（如图），请据图回答下列问题：

（1）人体内产生这种激素的部位是______．

（2）乙注射这种激素后，血糖浓度下降的原因是______．

（3）比较甲、乙两曲线，表明糖尿病患者可能通过______进行治疗．

我国第一艘航空母舰“辽宁舰”按计划完成建造和试验试航工作后，已正式交付海军。据此回答题。

军事专家指出，航空母舰是一个复杂的作战系统。作为大型水面舰艇，交付科研、试验、训练使用后，不仅舰上各类装置、电子系统、武器系统等需要调试，军舰内部各个系统之间需要磨合，与编队中其他舰艇的协同需要训练，舰载机飞行员训练、舰机协同等都需要较长时间完成。可见（）

①要用综合的思维方式来认识事物

②对新事物要有足够的耐心促进其成长

③要有实事求是的精神，按规律办事

④要做好量变的准备，等待质变的自然发生

A.①②③

B.①②④

C.①③④

D.②③④