【单选题】【消耗次数：1】
A police officer claimed he had attempted to ____ paying his fare.
①
avoid
②
reject
③
refuse
④
neglect
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相关题目
【单选题】
A police officer claimed he had attempted to _______ paying his fare.
①
avoid
②
reject
③
refuse
④
neglect
【单选题】
It was not until he arrived in class _____ realized he had forgotten his book.
①
when he
②
that he
③
and he
④
he
【单选题】
20. Only when he had handed in his exam paper ____ he had made several mistakes.
①
he has realized
②
does he realize
③
has he realized
④
did he realize
【单选题】
I should think they have done it ________, to avoid paying you the money.
①
with purpose
②
on purpose
③
in purpose
④
to purpose
【单选题】
He didn’t keep on asking me the time any longer as he had had his watch ____.?
①
repaired ?
②
to repair ?
③
repairing ?
④
repair?
【单选题】
3. He had to ______ his past actions when he retired, or he would be punished.
①
consider
②
account for
③
think
④
popular
【单选题】
His mother had talked to him for two hours while he was
watching TV, but_____.
①
a little did he hear
②
little did he hear
③
little heard he
④
a little heard he
【单选题】
The reason why he didn’t take the exam was _____ he had an accident on his way to the school.
①
because
②
because of
③
that
④
due to
随机题目
【单选题】
设<img class="kfformula" src="20200624/1592994646121055.png" data-latex="{N}_{A}" width="43" height="27"/>为阿伏加德罗常数的值，现有0.3mol/L<img class="kfformula" src="20200624/1592994646476247.png" data-latex="{K}_{2}{SO}_{4}" width="67" height="28"/>溶液，2L溶液中<img class="kfformula" src="20200706/1594010340325220.png" data-latex="{SO4}^{2-}" width="43" height="30"/>的浓度为（ ）mol/L。
①
0.6
②
0.3
③
0.9
④
1.0
【单选题】
下列关于氯水的说法正确的是（ ）。
①
氯水久置数天后溶液酸性减弱
②
氯水中只含<img class="kfformula" src="20200628/1593356077315366.png" data-latex="{C1}_{2}" width="56" height="36"/>和<img class="kfformula" src="20200628/1593356077557263.png" data-latex="{H}_{2}O" width="60" height="31"/>分子
③
新制氯水可使蓝色石蕊试纸先变红后褪色
④
光照氯水有气泡逸出，该气体是<img class="kfformula" src="20200628/1593356077371561.png" data-latex="{C1}_{2}" width="48" height="30"/>
【单选题】
在下列叙述中，能说明盐酸是强酸，醋酸是弱酸的是（）。
①
盐酸和醋酸都可用相应的钠盐与浓硫酸反应制取
②
将pH＝4的盐酸和醋酸稀释成pH＝5的溶液，醋酸所需加入的水量多
③
相同pH值的盐酸和醋酸分别跟锌反应时，产生氢气的起始速度相等
【单选题】
将0.lmol·<img class="kfformula" src="20200629/1593409309479184.png" data-latex="{L}^{-1}" width="46" height="31"/>醋酸溶液加水稀释，下列说法正确的是（）。
①
溶液中c（<img class="kfformula" src="20200629/1593409309358634.png" data-latex="{H}^{+}" width="36" height="32"/>）和c（<img class="kfformula" src="20200629/1593409309469275.png" data-latex="{OH}^{-}" width="55" height="27"/>）都减小
②
溶液中c（<img class="kfformula" src="20200629/1593409309586142.png" data-latex="{H}^{+}" width="45" height="26"/>）增大
③
醋酸电离平衡向逆反应方向移动
④
溶液的pH增大
【单选题】
下列说法正确的是（）。
①
常温下，任何物质的水溶液中都有<img class="kfformula" src="20200629/1593411466112134.png" data-latex="{H}^{+}和{OH}^{-}" width="102" height="37"/>，且Kw=c（<img class="kfformula" src="20200629/1593411466216289.png" data-latex="{H}^{+}" width="46" height="31"/>）·c（<img class="kfformula" src="20200629/1593411466607632.png" data-latex="{OH}^{-}" width="48" height="35"/>）=<img class="kfformula" src="20200629/1593411466190457.png" data-latex="{10}^{-14}" width="48" height="29"/>
②
NaCl溶液中既无<img class="kfformula" src="20200629/1593411466396791.png" data-latex="{H}^{-}" width="47" height="29"/>也无<img class="kfformula" src="20200629/1593411466750577.png" data-latex="{H}^{+}" width="42" height="32"/>
③
NaOH溶液中无<img class="kfformula" src="20200629/1593411466243508.png" data-latex="{H}^{+}" width="45" height="31"/>
④
HCl溶液中无<img class="kfformula" src="20200629/1593411466372752.png" data-latex="{OH}^{-}" width="58" height="30"/>
【单选题】
欲使0.1mol/L的<img class="kfformula" src="20200629/1593414655316335.png" data-latex="NaH{CO}_{3}" width="77" height="33"/>溶液中c（<img class="kfformula" src="20200629/1593414655655850.png" data-latex="{H}^{+}" width="39" height="28"/>）、c（<img class="kfformula" src="20200707/1594094658266332.png" data-latex="{{CO}_{3}}^{2-}" width="77" height="37"/>）、c（<img class="kfformula" src="20200706/1594030018177834.png" data-latex="{HC{O}_{3}}^{-}" width="80" height="36"/>）都减小，其方法是（）。
①
加入氢氧化钠固体
②
通入二氧化碳气体
③
通入氯化氢气体
④
加入饱和石灰水溶液
【单选题】
电解<img class="kfformula" src="20200629/1593420423792919.png" data-latex="{CuC1}_{2}" width="60" height="30"/>与NaCl的混合溶液，阴极上和阳极上最先析出的物质为( )。
①
<img class="kfformula" src="20200629/1593420423117793.png" data-latex="{H}_{2}和{O}_{2}" width="78" height="28"/>
②
<img class="kfformula" src="20200629/1593420423551028.png" data-latex="{H}_{2}和{C1}_{2}" width="101" height="35"/>
③
<img class="kfformula" src="20200629/1593420423553923.png" data-latex="Cu和{O}_{2}" width="66" height="27"/>
④
<img class="kfformula" src="20200629/1593420423316251.png" data-latex="Cu和{C1}_{2}" width="89" height="32"/>