一定量的稀硫酸跟过量铁粉反应,为了减缓反应速率,又不影响生产氢气的总量,可向稀硫

题型:选择题

问题:

一定量的稀硫酸跟过量铁粉反应,为了减缓反应速率,又不影响生产氢气的总量,可向稀硫酸中加入适量的[ ]

A.(固体)

B.(固体)

C.(溶液)

D.(固体)

考点:影响化学反应速率的因素
题型:选择题

You will succeed in the end _______ you give halfway.

A.even if

B.as though

C.as long as

D.unless

题型:选择题

既是我们了解、掌握生物的形态、结构、生活习性等第一手材料的基本方法,又是探究生命科学的第一步的是(  )

A.观察

B.实验

C.调查

D.分类

题型:选择题
Even though it was only October, my students were already whispering about Christmas plans. With each passing day everyone became more __36__, waiting for the final school bell. Upon its _37____everyone would run for their coats and go home, everyone except David.
David was a small boy in ragged clothes. I had often _38___what kind of home life David had, and what kind of mother could send her son to school dressed so __39_ for the cold winter months, without a coat, boots, or gloves. But something made David __40_. I can still remember he was always __41____a smile and willing to help. He always _42__after school to straighten chairs and mop the floor. We never talked much. He__43___just simply smile and ask what else he could do, then thank me for letting him stay and slowly__44___home.
Weeks passed and the __45___over the coming Christmas grew into restlessness until the last day of__46__before the holiday break. I smiled in ___47 __as the last of them hurried out the door. Turning around I saw David ___48___standing by my desk..
“I have something for you ”he said and ____49____from behind his back a small box .__50___it to me, he said anxiously, “Open it ”I took the box from him ,thanked him and slowly unwrapped it. I lifted the lid and to my __51__, I saw nothing. I looked at David’s smiling face and back into the box and said,“The box is nice ,David ,but it’s__52__”.
“Oh no, it isn’t”said David.“It’s full of love. My mum told me before she died that love was something you couldn’t see or touch unless you know it’s there.”.
Tears filled my eyes ___53___I looked at the proud dirty face that I had rarely given____54___to. After that Christmas, David and I became good friends and I never forgot the meaning ___55___the little empty box set on my desk .
小题1:
A.anxious B.courageous C.serious D.cautious
小题2:
A.warning B.ringing C.calling D.yelling
小题3:
A.scolded B.wondered C.realized D.learned
小题4:
A.modestlyB.naturally C.inaccuratelyD.improperly
小题5:
A.popular B.upset C.special D.funny
小题6:
A.expressing B.delivering C.wearing D.sharing
小题7:
A.practicedB.wandered C.studied D.stayed
小题8:
A.wouldB.should C.might D.could
小题9:
A.aim at B.turn to C.put off D.head for
小题10:
A.argument B.excitement C.movementD.judgment
小题11:
A.school B.year C.educationD.program
小题12:
A.relief B.return C.vain D.control
小题13:
A.weaklyB.sadly C.quietly D.helplessly
小题14:
A.searched B.found C.raised D.pulled
小题15:
A.Holding B.Handing C.Sending D.Leaving
小题16:
A.delight B.expectationC.appreciation D.surprise
小题17:
A.cheap B.empty C.useless D.special
小题18:
A.as B.until C.because D.though
小题19:
A.advice B.support C.attention D.command
小题20:
A.from B.behindC.over D.towards
题型:选择题

灌溉对作物外界环境及作物的影响表现在几个方面?

题型:选择题

幼儿园工作评价是依据一定的标准与程序,有目的、有计划、有组织地对园所各个方面的工作进行科学调查,搜集、整理、处理相关信息,并做出()的过程。

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