Dear sir ,
I have travel every day from Souk Road to the airport. Two buses travel along the routes: the(路线): the number 49 and the number 16. But by the time the number 16 bus reaches Souk Road, it is always full, so I can’t get on it, I have to wait for the number 49 because sometimes there are empty seats on it.
The timetable says that there are buses from Souk Road to the airport every ten minutes. If this is true, why do I have to wait half an hour for a bus nearly every day?
The rules say that if there are empty seats on a bus, the bus must stop at every stop where people are waiting Why do the half-empty buses go straight(一直)past me when I am standing at bus stop?
The rules say that no bus may carry more than 40 seated passengers and 20 standing passengers. Yesterday I was the first to get off the bus when it reached the airport. I counted the other passengers as they got off. There were 129 people.
It is clear that our bus companies break the rules and think little of their passengers. Can nothing be done to make your service(服务) better?
Yours
Tired passenger
小题1:This passage is __________.
A．a message
B．a talk
C．a story
D．a letter小题2:The writer has to take Bus No. 49 because______.
A．it arrives on time
B．it is not always full
C．it travels faster
D．it has fewer seats on it小题3:How long does the writer usually have to wait for a bus?
A．Ten minutes
B．One hour
C．Half an hour
D．Nearly a day小题4:The rules say that each bus may carry ________ passengers at most.
A．twenty
B．forty
C．sixty
D．one hundred and twenty-nine小题5:From the passage we can see that__________.
A．the bus service was poor
B．no passengers took their buses
C．no buses except the No. 49 bus passed Souk Road
D．the writer was always the first to get on bus
衰变时，生成核与原来的原子核相比，中子数减少了2个
射线是原子核外的电子电离形成的电子流，它具有较强的穿透能力
含有两个质子和两个中子，所以发生
射线来自于原子核内部，是由原子核内的一个中子生成一个电子和质子而成选项B错。半衰期是统计学规律，对大量粒子才适用，l0个原子核数量太少，无法预测衰变的数量，选项C错。氢原子的核外电子由较高能级跃迁到较低能级时，多余的能量以光子的形式释放出去，由于高能级靠近原子核，所以静电力做正功，动能增大电势能减少，选项D对。