“纳米材料”是当今材料科学研究的前沿，其研究成果广泛应用于催_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

“纳米材料”是当今材料科学研究的前沿，其研究成果广泛应用于催化及军事科学中。“纳米材料”是指研究、开发出的直径从几纳米至几十纳米的材料。如将“纳米材料”分散到液体分散剂中，所得混合物可能具有的性质是

A．所得分散系不稳定

B．能全部透过半透膜

C．不能透过滤纸

D．有丁达尔效应

答案

答案：D

题目分析：根据纳米材料的分子大小可知，将“纳米材料”分散到液体分散剂中，所形成的分散系是胶体，能透过滤纸，但不能透过半透膜，具有丁达尔效应，答案选D。

点评：该题是高考中的常见考点，试题以“纳米材料”位载体，主要是对学生基础知识的检验和训练，有利于调动学生的学习兴趣和学习积极性，也有利于培养学生的逻辑推理能力。

导致东欧社会主义国家发生巨大变革的共同根源是（）

A．对个人的盲目崇拜

B．改革成效不大

C．斯大林模式的束缚

D．西方的和平演变

完形填空

完型填空（共20小题，每小题1分，满分20分）
The sun didn’t come out. The 15 – year – old girl Razeena said goodbye to her mother and left for school. She was thinking about the coming Christmas and   21  the holiday lights at the nearby senior citizens’ apartment   22  she noticed some smoke through the door.
The building is on fire ! She looked around wildly, 23   not a soul was in   24    .
Razeena   25  .“Fire ! ” she yelled, running into the hallway and striking on every door she saw, “Everybody get   26 !” The building had two floors, she pulled herself   27  ,where the thick   28  was hanging just a few feet   29  the floor. She could see pairs of slippered feet——but no one was moving. She   30  they couldn’t see where to go ! “Down here ! and follow me !” she yelled.   31  a sleeve over her mouth, she led the elderly residents (居民) down the stairs.
So she pounded up and down the stairs, weaving through the smoke and heat to   32  more people. “ Take my arm,” she told the extremely   33  residents. Her eyes burned and flames were hissing louder. Finally, she led the last person out.   34  stood on the side walk, dazed and crying. “Thank you so much,” they told her over and over, “ Without you, we never would have   35 .”
When Razeena walked home, shaking and   36  with dirt, mother cried, “ What happened?!”
“ There was a fire…so many people … I think I   37  them all.” She burst into tears, “ I   38  my uniform. I thought you might be mad! ” Mother   39  her head, tears in her eyes, “Oh honey, I’m so   40  of you,” she whispered.

A．carried out