AB和CD为圆上两条相互垂直的直径，圆心为O。将电量分别为+q和-q的两点电荷放

PFM桥的桥体是恢复缺失牙形态、功能、美观的人造牙部分。决定桥体形态的因素包括美观、发音功能、面形态以及基底面形态的恢复。

桥体制作中保护基牙的健康、减少力的措施除外（）。

A.减小桥体的颊舌径宽度

B.加大外展隙

C.降低牙尖高度

D.桥体与黏膜接触部尽量用瓷

E.加深面的沟槽

We always try to include some kind of Smile Card activity during my monthly       with my daughter Rachel. The other hot night, after dinner we went to an ice cream shop. When      for our ice cream we told the cashier that we would like to buy ice cream anonymously (匿名地) for the       person who came to the counter as a random act of      . Puzzled but excited, she       our money and a Smile Card. We sat down at the table near the counter—Rachel wanted to spy on our        one.

About five minutes later the cashier       told us, “Oh, good! Someone's coming!” It was a woman with two little kids. As the woman reached for her      , the cashier, handing her the      , told her that       wanted to, anonymously, buy her family's ice cream. She couldn't       it. “Seriously?” she asked. Rachel and I       not to notice. It was great. The cashier, aware that we wanted to remain anonymous, came over to “wipe off our table,”       leaving our change on our table. She was about as        as we were. 

After enjoying our ice cream, we took a napkin(纸巾) and wrote a       to the cashier thanking her for her assistance. We       until she went to the back room, quickly       the note, a nice tip, and a second Smile Card on the      , and ran out before we were seen. 

I treasure every date night with my daughter and       the world through her eyes is always       for me.

小题1:  

A．date

B．game

C．dinner

D．travel小题2:  

A．preparing

B．looking

C．asking

D．paying小题3:  

A．nice

B．next

C．poor

D．last小题4:  

A．responsibility

B．politeness

C．understanding

D．kindness小题5:  

A．refused

B．changed

C．took

D．borrowed小题6:  

A．warm-hearted

B．unfortunate

C．lucky

D．curious小题7:  

A．quietly

B．quickly

C．loudly

D．slowly小题8:  

A．wallet

B．glasses

C．ice cream

D．phone小题9:  

A．money

B．napkin

C．Smile Card

D．change小题10: 

A．no one

B．anyone

C．none

D．someone小题11: 

A．accept

B．believe

C．follow

D．doubt小题12: 

A．decided

B．hoped

C．pretended

D．intended小题13: 

A．secretly

B．seriously

C．openly

D．friendly小题14: 

A．nervous

B．embarrassed

C．surprised

D．happy小题15: 

A．notice

B．note

C．check

D．paragraph小题16: 

A．ate

B．waited

C．wrote

D．left小题17: 

A．placed

B．gave

C．handed

D．passed小题18: 

A．newspaper

B．chair

C．counter

D．floor小题19: 

A．changing

B．seeing

C．hearing

D．exploring小题20: 

A．difficult

B．funny

C．distant

D．fantastic

The food cooked by my mother smells ______ and I really enjoyed it. [ ]

A. well

B. good

C. bad

D. badly

在借贷记账法下，借方表示资产增加、费用增加，以及负债及所有者权益的减少。 ( )

下列有关热的说法不正确的是（　　）

A．晶体在熔化过程中温度不变，内能也不变

B．用锯锯木头，锯条发热．这是通过做功改变物体的内能

C．用水作汽车冷却液，是因为水的比热容大

D．火箭用液态氢作燃料，是因为氢的热值大