问题 选择题

下列叙述正确的是

A.二氧化硅是酸性氧化物,不与任何酸反应

B.因为CO2通入水玻璃中可制得硅酸,说明碳酸的酸性比硅酸酸性强

C.SiO2晶体中,每个硅原子与两个氧原子相连

D.工业上制玻璃的主要原料有:黏土、石灰石、石英

答案

答案:B

题目分析:A、二氧化硅是酸性氧化物,但能和氢氟酸反应生成四氟化硅与水,A不正确;B、根据较强酸制备较弱酸的原理可知,CO2通入水玻璃中可制得硅酸,说明碳酸的酸性比硅酸酸性强,B正确;C、SiO2晶体中,每个硅原子与4个氧原子相连,C不正确;D、工业上制玻璃的主要原料有:纯碱、石灰石、石英,D不正确,答案选B。

完形填空

完形填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,掌握其大意,然后从各题所给的四个选项中,选出最佳选项。

After years of searching, a truth seeker was told to go to a cave, in which he would find a well. “Ask the well what is   36  , ” he was advised, “and the well reveal (告诉,揭露) it to you.” Having found the well, the seeker asked that most basic and important   37  . And from the depths came the answer: “Go to the village crossroad, and there you shall find what you are seeking.”

Full of   38   the man ran to the crossroad to   39   only three rather uninteresting shops. One shop was selling pieces of metal, another sold   40  , and thin wires were for sale in the third. Nothing and no one there seemed to   41   much to do with the revelation of truth.

Disappointed, the seeker returned to the well to demand an   42  , but he was told only: “You will   43   in the future.”

As years went by, the   44   of his experience at the well gradually   45   until one night, while he was walking, the sound of sitar (西塔琴) music   46   his attention. It was wonderful and it was   47   with great skill and inspiration.

Deeply  48  , the truth seeker felt drawn towards the   49  . He looked at the fingers dancing over the strings. And then suddenly he let out a cry of joyful   50  : the sitar was made out of wires and pieces of metal and wood just like   51   he had once seen in the three stores.

At last he understood the   52   of the well: we have already been given everything we need; our   53   is to assemble (聚集) and use them in the proper way. Nothing is   54   so long as we recognize only fragments (碎片). But as soon as the pieces are put together, something new appears, whose nature we could not have   55   by considering the fragments alone.

A. truth   B. hope   C. future D. music

A. fact    B. reason C. question     D. well

A. energy       B. hope   C. mystery      D. surprise

A. get     B. count  C. find    D. open

A. instruments       B. clothing     C. food   D. wood

A. connect      B. have   C. prepare      D. offer

A. explanation       B. advice C. excuse D. opportunity

A. succeed      B. discover     C. pay     D. understand

A. bitterness   B. failure C. memory     D. secret

A. doubled     B. forgot C. disappeared       D. recovered

A. paid    B. lost     C. split    D. caught

A. played       B. broadcast    C. enjoyed      D. conducted

A. annoyed     B. moved       C. confused    D. frightened

A. adviser       B. director      C. composer   D. player

A. admiration B. distinction  C. recognition D. imagination

A. those  B. that     C. it D. them

A. secret  B. message     C. theory D. benefit

A. target  B. difficulty    C. task    D. shortcoming

A. interesting  B. meaningful C. accessible   D. successful

A. foreseen(预见)  B. decided      C. judged       D. formed

单项选择题