新一期《科学》杂志说，康奈尔大学的科学家把一部微型马达与一个_爱下问搜题

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问题单项选择题

新一期《科学》杂志说，康奈尔大学的科学家把一部微型马达与一个金属螺旋桨组装在一起，使螺旋桨能够以8转/秒的速度旋转。该大学生物工程教授蒙泰马尼奥说：“这是一台真正的纳米机器，”这台马达是从给细胞提供能量的分子中获得能量的，所以他认为科学家终将能够制造出比细菌还小的机器人。它们将能够修复细胞损伤，制造药物并且攻击癌细胞。他说：“这为制造在细胞中运转的机器打开了大门。这将使我们把设计好的装置与生命系统融合起来。”划线的句子中“这”指代的对象是( )。

A．纳米马达

B．比细菌还小的机器人

C．纳米技术

D．在细胞中运转的机器

答案

参考答案：C

完形填空

Mr, Evans lives and works in Sydney. Last week he had a        holiday, but he didn’t know
      to go. He said to his friend Robert,” I hate the hot weather here, but I can’t           a cool place in Australia. Where should I go      a holiday.
“That’s easy,” said Robert, ”You can go to Moscow. Snow and ice are covering the ground there now.” Mr. Evens          his advice. He bought a plane ticket and        Moscow. He enjoyed himself there, but one day he got into trouble. After lunch         a cold day, he went to a park in the city. He found that a dog followed him when he walked         a house. It seemed hungry. Maybe it wanted some food        , he thought. However, Mr. Evans had      food in his pockets. He tried to make the dog         ,but it began to bark at him. Just at that moment, he         a small stone on the ground. He tried to pick it up, but he        .
“     strange these Russians are!”Mr. Evans said to        .”They tie up stones instead of their dogs.

B．two weeks’

C．two week’s

B．think about

选择题

图中拥有经济特区最多的一个省是：

A．①

B．②

C．③

D．④