问题 填空题

新产生的细胞体积都______,通过不断的从周围环境中吸收______,并且转变成自身的______,体积逐渐______,这就是细胞的______.

答案

母细胞通过分裂形成两个相似的子细胞,两个子细胞的体积和与母细胞相同.因此,新产生的细胞体积都较小;新产生的细胞通过不断地从周围环境中吸收营养物质,并转化成细胞内部自身的物质,使其体积不断增大;这种细胞体积增大的过程就是细胞的生长.

故答案为:

较小;营养物质;物质;增大;生长

多项选择题
完形填空
“ Just sign here, sir,” the deliveryman said as he handed Oscar Reyna a packet.
The package consisted of a long, narrow box   36  wrapped in brown paper.   37  the box, Oscar saw an umbrella inside—a very old one with a beautifully carved wooden handle.   38  he had not seen it in more than 20 years, he recognized it   39 .
Oscar was 16 when he first saw the   40  umbrella. He had gone to a concert with his grandparents. As they were leaving, he noticed an umbrella on an empty seat. Impressed by its   41  Oscar felt a strong desire to find its   42 .
Oscar   43  the manager to look in the record of advance ticket sales. Just as he thought, a man matched the seat   44  Oscar had found the umbrella. The name was Mrs. Katie O’Brien.
Oscar talked his grandparents into going by Mrs. O’Brien   45  on their way home. He rang the bell, the door opened, and an elderly woman appeared. “May I   46  you?” she asked.
“I’d like to return it if it’s yours,” Oscar said,   47  the umbrella as if presenting a   48  that had long been wished for.
“ Why, yes ! It’s mine,” replied Mrs. O’Brien with a   49  smile and shining eyes. “It was given to me by my father years ago. Thank you so much for returning it. May I offer you a reward for your   50 ?
“No, ma’ma, ”he said , “My grandmother says that a good deed is its own reward.”
“Well, that’s   51  what my father used to say. What is your name, young man?”
Years later Oscar was staring at the finely carved handle of the umbrella as he remembered Mrs. O’ Brien. It was in perfect condition, considering how   52  it was. Why had it arrived here today?
As if   53  , a note fell from the paper. It read:Mrs. O’Brien wanted you to   54  this umbrella as a present for a kind,   55  gesture long ago.
小题1:
A.strictlyB.carefullyC.roughlyD.casually
小题2:
A.OpeningB.SeizingC.ObservingD.Searching
小题3:
A.AfterB.WhenC.SinceD.Although
小题4:
A.clearlyB.fullyC.immediatelyD.suddenly
小题5:
A.averageB.unusualC.plainD.typical
小题6:
A.beautyB.shapeC.originD.history
小题7:
A.designerB.sellerC.userD.owner
小题8:
A.convincedB.forcedC.encouragedD.advised
小题9:
A.untilB.beforeC.whichD.where
小题10:
A.familyB.theatreC.houseD.neighborhood
小题11:
A.inviteB.helpC.botherD.know
小题12:
A.putting upB.turning outC.picking upD.holding out
小题13:
A.chanceB.factC.giftD.result
小题14:
A.wideB.confidentC.proudD.shy
小题15:
A.patienceB.kindnessC.courageD.determination
小题16:
A.obviouslyB.naturallyC.exactlyD.probably
小题17:
A.oldB.rareC.preciousD.nice
小题18:
A.in contrastB.in returnC.in exchangeD.in answer
小题19:
A.possessB.acceptC.carryD.value
小题20:
A.attractiveB.significantC.unselfishD.sympathetic