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【单选题】
要除去下列各物质中的少量杂质，所选用的试剂或方法正确的是 （ ） 选项 物质（括号内为杂质） 除杂试剂A.
Fe粉（CuO） 盐酸
B.
氯化钠（Na 2 CO 3 ） 稀硫酸
C.
N 2 （O 2 ） 通过灼热的木炭层
D.
NaOH溶液［Ca（OH） 2 ］ Na 2 CO 3 溶液
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【单选题】听力原文：M: It's partly your own fault. You should never let in anyone like that unless you're expecting him. W: It's all very well to say that, but someone comes to the door and says 'electricity' or 'ga...
A.
She thinks it is easier said than done.
B.
She totally agrees with him.
C.
She feels that what he says is simply nonsense.
D.
She thinks that he is a rather impolite person.
【单选题】It's an orchestrated way of thinking that enables you yo decompose your thinking at any moment.
A.
coordinated
B.
refined
C.
disorganized
D.
sophisticated
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