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【简答题】
甲、乙、丙是三种常见的单质，X、Y、Z是它们的化合物，它们之间有如下图所示的转化关系： （1）若甲是具有还原性的金属单质，X、Y、Z中有一种是离子晶体，试推断： ①X、Y、Z中含有丙元素的是 ； ②写出Y的电子式 ； ③写出X与甲反应的化学方程式，并标出电子转移的方向和数目： （2）若甲是具有氧化性的黄绿色气体单质，丙通常是暗红色的液体，Y和Z 具有相同的阳离子，X与Z含有相同的离子。 ①写出乙物质的化学试 ； ②写出X与足量的甲在溶液中完全反应的离子方程式：
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A.
20 minutes’ walk
B.
20 minute’s walk
C.
20-minutes walk
D.
20-minute walk
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【单选题】It takes her about 20 minutes _______to school.
A.
get
B.
gets
C.
getting
D.
to get
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【单选题】It only __________ him 20 minutes __________ to his office every day.
A.
takes; to  drive
B.
took; drive
C.
takes; drive D  takes took
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A.
正确
B.
错误
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【单选题】Fifty years ago, most people lived in rural areas. But the world has changed. In the near future, more than half of all people will live in cities for the first time in history. City life is not alway...
A.
urbanization and its effects
B.
a huge effect of human
C.
economic development
D.
the environment
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【单选题】Tom______half an hour doing his homework and listening to pop music ______him 20 minutes.
A.
costs; spends
B.
spends; take
C.
takes; costs
D.
spends; takes
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【单选题】It takes Mr Wang 20 minutes lunch every day.
A.
、 cook     
B.
、 to cook     
C.
、 cooking     
D.
、 cooks
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【单选题】It _______ me 20 minutes _______ to the park.
A.
spends ; to walk
B.
spends ; walking
C.
takes ; to walk
D.
takes ; walking
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【单选题】Tom takes 20 minutes to cook an egg and 5 minutes to make a sandwich. Jerry takes 15 minutes to cook an egg and 3 minutes to make a sandwich. Tom has a comparative advantage in ________ and Jerry has ...
A.
cooking eggs; making sandwiches
B.
making sandwiches; cooking eggs
C.
neither of these activities; both activities
D.
both activities; neither of these activities
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相关题目：
【单选题】— Hurry up!It's already 8:20. — ________ ! It takes only 20 minutes to get to the station and the train doesn't leave until 9:20. [     ]
A.
No hurry
B.
No way
C.
No problem
D.
No chance
查看完整题目与答案
【单选题】Every morning Mr. Smith takes a ______ to his office.
A.
20 minutes’ walk
B.
20 minute’s walk
C.
20-minutes walk
D.
20-minute walk
查看完整题目与答案
【单选题】It takes her about 20 minutes _______to school.
A.
get
B.
gets
C.
getting
D.
to get
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【单选题】It only __________ him 20 minutes __________ to his office every day.
A.
takes; to  drive
B.
took; drive
C.
takes; drive D  takes took
查看完整题目与答案
【判断题】已选择执行《企业会计准则》的小企业，不得在执行《企业会计准则》的同时，选择执行《小企业会计准则》的相关规定。( )
A.
正确
B.
错误
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【单选题】Fifty years ago, most people lived in rural areas. But the world has changed. In the near future, more than half of all people will live in cities for the first time in history. City life is not alway...
A.
urbanization and its effects
B.
a huge effect of human
C.
economic development
D.
the environment
查看完整题目与答案
【单选题】Tom______half an hour doing his homework and listening to pop music ______him 20 minutes.
A.
costs; spends
B.
spends; take
C.
takes; costs
D.
spends; takes
查看完整题目与答案
【单选题】It takes Mr Wang 20 minutes lunch every day.
A.
、 cook     
B.
、 to cook     
C.
、 cooking     
D.
、 cooks
查看完整题目与答案
【单选题】It _______ me 20 minutes _______ to the park.
A.
spends ; to walk
B.
spends ; walking
C.
takes ; to walk
D.
takes ; walking
查看完整题目与答案
【单选题】Tom takes 20 minutes to cook an egg and 5 minutes to make a sandwich. Jerry takes 15 minutes to cook an egg and 3 minutes to make a sandwich. Tom has a comparative advantage in ________ and Jerry has ...
A.
cooking eggs; making sandwiches
B.
making sandwiches; cooking eggs
C.
neither of these activities; both activities
D.
both activities; neither of these activities
查看完整题目与答案
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