问题 单项选择题 共用题干题

患者女,70岁,上下颌牙列缺失,行全口义齿修复,支架试戴正常,排牙充胶,采用微波聚合,戴牙时发现塑料基托与黏膜不密合,而金属基托未见异常。

微波聚合法是采用电子学加热的方法使塑料产生高速聚合,其原理是()。

A.原子内加热

B.原子外加热

C.分子内加热

D.分子外加热

E.以上都不是

答案

参考答案:E

单项选择题
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When I was a boy growing up in New Jersey in the 1960s, we had a milkman delivering milk to our doorstep. His name was Mr. Basille. He wore a white cap and drove a white truck. As a 5-year-old boy, I couldn’t take my eyes off the coin changer fixed to his belt. He noticed this one day during a delivery and gave me a quarter out of his coin changer.

Of course, he delivered more than milk. There was cheese, eggs and so on. If we needed to change our order, my mother would pen a note—“Please add a bottle of buttermilk next delivery”—and place it in the box along with the empty bottles. And then, the buttermilk would magically(魔术般)appear.

All of this was about more than convenience. There existed a close relationship between families and their milkmen. Mr. Basille even had a key to our house, for those times when it was so cold outside that we put the box indoors, so that the milk wouldn't freeze. And I remember Mr. Basille from time to time taking a break at our kitchen table, having a cup of tea and telling stories about his delivery.

There is sadly no home milk delivery today. Big companies allowed the production of cheaper milk thus making it difficult for milkmen to compete (竞争). Besides, milk is for sale everywhere, and it may just not have been practiced to have a delivery service.

Recently, an old milk box in the countryside I saw brought back my childhood memories. I took it home and planted it on the back porch (门廊). Every so often my son's friends will ask what it is. So I start telling stories of my boyhood, and of the milkman who brought us friendship along with his milk.

小题1:Mr. Basille gave the boy a quarter out of his coin changer     .

A.to show his magical power

B.to pay for the delivery

C.to satisfy his curiosity

D.to please his mother小题2:What can be inferred from the fact that the milkman had the key to the boy's house?

A.He wanted to have tea there.

B.He was a respectable person.

C.He was treated as a family member.

D.He was fully trusted by the family.小题3:Why does home milk delivery no longer exist?

A.Nobody wants to be a milkman now.

B.It has been driven out of the market.

C.Its service is getting poor.

D.It is forbidden by law.小题4:Why did the author bring back home an old milk box?

A.He missed the good old days.

B.He wanted to tell interesting stories.

C.He needed it for his milk bottles.

D.He planted flowers in it.