pH试纸与石蕊试液相比，石蕊试液的缺点是 （   ）   

三角尺在灯泡O的照射下在墙上形成的影子如图所示．若OA=20cm，OA′=50cm，则这个三角尺的周长与它在墙上形成的影子的周长的比是（　　）

阅读下面短文，掌握大意。然后从A.B.C.D四个选项中选出最佳选项 
I was waiting for the bus when I met the woman. “You look   26  . Come and sit here,” she said. “ 27   are you going?”
“I don’t know. I just want to catch a  28    and see what it will be like at the end.”
“I’m afraid you’ll see  29   there. Why don’t you enjoy the sights on the way?”
“How can I do that while my heart’s   30   ?” I asked sadly. My best friend had left me.
The woman seemed to understand my feeling. “Don’t cry, little girl. I’ve had a similar experience to you. Thirty-five   31   ago, my husband left our three children and me. I was deadly sad. I decided to kill myself and the children, so I took    32   to the sea.   33  ，they seemed to know what would happen, so they   34   loudly. Their cry suddenly woke me 35   . How could I  36    my hope to live for one of life’s problems? After that, I worked hard to raise the children. Now they all live   37    and one of them has his own family.
Then the woman gave me a   38  , “We should never wait for the door to   39     before us. We should find the key to the  40   or try to find another way”
The bus came and I got on it with a smile

【小题1】 A．tired B．excited C．happy D．well

【小题2】 A．What B．How C．Where D．When

【小题3】 A．train B．bus C．boat D．plane

【小题4】 A．nothing B．everything C．something D．anything

【小题5】 A．smiling B．breaking C．singing D．dancing

【小题6】 A．days B．weeks C．months D．years

【小题7】 A．her B．them C．him D．it

【小题8】 A．So B．Or C．Besides D．However

【小题9】 A．laughed B．talked C．spoke D．cried

【小题10】 A．in B．out C．up D．down

【小题11】 A．give away B．give up C．get up D．stand up

【小题12】 A．happily B．sadly C．badly D．hopeless

【小题13】 A．cry B．shout C．hit D．smile

【小题14】 A．open B．close C．lock D．mend

【小题15】 A．classroom B．office C．door D．shop

南北战争在美国历史上被称为美国历史上第二次资产阶级革命，其原因是（    ）