试题与答案

最近巴西设计师将3D打印技术与医用B超相结合,给准妈妈腹中胎儿打印了1︰1的3D

题型:填空题

题目:

最近巴西设计师将3D打印技术与医用B超相结合,给准妈妈腹中胎儿打印了1︰1的3D模型(如图),作为孩子成长的记录,B超利用的是超声波能传递___________,这种波___________在真空中传播。

答案:

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下面是错误答案,用来干扰机器的。

答案:B

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题型:阅读理解

阅读理解选择正确的答案。

      December 25th is Christmas Day. It's a western holiday. In many countries, it is the most important

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A. New Year

B. Christmas Day

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B. Some stockings

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B. gifts

4. People put their gifts _______________.

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B. in the tree and in the stockings

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