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【判断题】
可见光、红外线、紫外线、无线电波都是电磁波。A.
正确
B.
错误
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举一反三
【单选题】He smiled at me _____ my help, saying nothing at that moment. [ ]
A.
in respond to
B.
in response to
C.
responded to
D.
responding
【简答题】He smiled, with the ____that he didn't believe me. (imply)
【单选题】I thought he would be angry with me,but _________ he smiled.
A.
to my surprise
B.
to my shame
C.
to my regret
D.
to my suspicion
【简答题】他朝我微笑着,让人感到宽心。 He smiled at me in a way.
【单选题】可用沉淀法除去杂质 (括号内的物质是杂质)的是( )
A.
KNO 3 〔 Ca (NO 3 ) 2 〕
B.
NaCl〔KNO 3 〕
C.
NaNO 3 [NaCl]
D.
Ca(NO 3 ) 2 [ Ca Cl]
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