甲基丙烯酸甲酯本体聚合,当转化率较高时,会出现聚合反应速率()现象这种现象又称为()

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问题:

甲基丙烯酸甲酯本体聚合,当转化率较高时,会出现聚合反应速率()现象这种现象又称为(),产生这种现象的原因是()。

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下图为人体某早期胚胎细胞所经历的生长发育阶段示意图,图中①~⑥为各个时期的细胞,a~c表示细胞所进行的生理过程。请回答:

(1)与①相比,②的表面积与体积的比值________,与外界环境进行物质交换的能力___________。

(2)如果不能正常完成c过程,则③、④均可能成为____________。

(3)若⑤、⑥已失去分裂能力,则其细胞内遗传信息的主要传递方向为_______________。

(4)图中①~⑥各细胞中的核DNA和mRNA相同吗?___________________________。

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我国南方一些雨水充沛的地区,夏季如果有一个月不下雨,常会发生严重的旱灾;而沙漠地区一年不下雨也不会发生旱灾。这是为什么?

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  On Christmas morning, I went to the Cockhedge Mall. People there were all busy buying their last minute requirements. I needed to buy a birthday card for my son-in-law whose birthday is the 29th of December. Picking up a few more things as well as my cared I went to join the line for the express checkout which was for people who only had a few items in a basket and not a trolley load. This line was next to the Customer Service desk.

Seemingly waiting quite a long time, I was jogged out of my thoughts by a voice behind me making comments on the things I bought.

It was so funny when I realized that she was describing the contents of my basket. The owner of the voice was a very pretty young lady. I said to her that I was going to buy a box of Christmas cookies but the only ones left were not to my liking. The lady told me that just opposite Cockhedge in Superdrug they had lots of cookies. I said, “I’m not going to bother now. I had enough of shops and I’m going home.”

The assistant from the Customer Service came across at this time saying “If there is anyone in the line with a few items in their basket, none of which needed to be weighed, I will check out their groceries at the desk.” Because I had the sprouts which needed to be weighted, the young lady accepted the offer and walked away waving goodbye.

Eventually my turn came at the checkout. I was walking away when I met my new friend once again who handed me a beautiful box of Christmas cookies. With a big hug she said “Hope you have a lovely Christmas.” She had been into Superdrug to buy me the cookies while I was still queuing in Cockhedge.

What a generosity to a stranger! I was so surprised you could have knocked me down with a feather. My Good Samaritan would never know what a joyful Christmas day I had with my family. Telling them this story, as we ate around the table, kept everyone spellbound.

小题1:The underlined word “spellbound” in the last paragraph probably means         .

A.interested

B.disappointed

C.astonished

D.frightened小题2:Which of the following could be the best title of the story?

A.A Piece of Lucky Feather

B.A Surprise Christmas Gift

C.The Boring Shopping Experience

D.The Unforgettable Big Hug小题3:How does the writer feel about the pretty young lady?

A.Worried.

B.Satisfied.

C.Grateful

D.Proud.小题4:What can we learn from the story?

A.Nobody is sure what will happen the next moment.

B.A simple action can bring other people happiness.

C.Being patient will decrease the waiting time.

D.Life without hope and faith is a full thing.

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20世纪末,我国已经初步建立了社会主义市场经济体制。

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白蚁和蚂蚁有什么关系?

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