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【简答题】
铜和铁一样容易生锈，铜表面生成绿色铜锈，为了探究铜锈的组成，某兴趣小组从铜器上取下绿色粉未，按如下步骤进行实验。请回答下列问题： （1）写出B物质的化学式 ，步骤⑤的化学方程式为 ； （2）步骤③得到两种气体，请简述其中一种气体的检验方法 ； （3）步骤④可以得到煤气（主要成分是H 2 和CO）的一种成分，写出步骤⑦的化学方程 式 ；通过以上实验可知，铜绿的组成元素是 。
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举一反三
【单选题】Ma Dong didn't write out the right answer, _____. [ ]
A.
neither did I
B.
neither didn't I
C.
I'm too
D.
either I
【单选题】听力原文：M: Didn't I tell you? I retired on Friday. W: Really! I didn't think you'd be retiring for another five years or so. M: Well. I'll be seventy then, you know. W: Well. I never! I thought you were ...
A.
In his fifties.
B.
In his sixties.
C.
Seventy.
D.
Seventy-five.
【简答题】最安全,经济的营养补给途径是
【简答题】A．warnings B．clues C．symbols D．evidences
【单选题】— I plan to go out for a trip, but I'm afraid I don't know the ______. — A map is helpful, I think. [ ]
A.
price
B.
way
C.
time
【简答题】解释锌族元素硫化物的溶解度及颜色变化原因。
【单选题】According to the (literature) in this field, expert (evidences) originally (appeared) in England, and later (got widen used) in the Commonwealth countries.
A.
literature
B.
evidences
C.
appeared
D.
got widen used
【简答题】和物体在力的方向上发生的 ,是做功的两个不可缺少的因素。
【单选题】—I’m sorry, but I didn’t mean ____ out your secret. —But you know, letting out secret means ____ one’s feelings.
A.
to let; to hurt
B.
letting; hurting
C.
to let; hurting
D.
letting; to hurt
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