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【单选题】
下列性质中 , 碱金属和碱土金属都不具有的是A.
与水剧烈反应
B.
与酸反应
C.
与碱反应
D.
与强还原剂反应
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反馈参考答案：
举一反三
【简答题】Your duty now is______ (study)．
【简答题】线性方程组有解当且仅当它的系数矩阵的秩与增广矩阵的秩 .
【简答题】Is your son showing his friends the photos now? (用often代替now) _______________________________________________________?
【单选题】I used to _____ a lot, but now I have become fatter, for I mainly stay at home watching TV. [ ]
A.
turn out
B.
work out
C.
help out
D.
take out
【单选题】I turned over the chinese vase by accident while I cleaned the desk and now it is _________.
A.
in turn
B.
in pieces
C.
in ruins
D.
in trouble
【单选题】We have been on duty for four hours and ____. [ ]
A.
now comes your tum
B.
now does your tum come
C.
now your tum comes
D.
comes now your turn
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