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【单选题】
已知：X 2 、Y 2 、Z 2 、W 2 四种物质的氧化能力W 2 >X 2 >Y 2 >Z 2 ，下列氧化还原反应能发生的是 [ ]A.
2NaW+Z 2 =2NaZ+W 2
B.
2NaX+Z 2 =2NaZ+X 2
C.
2NaY+W 2 =2NaW+Y 2
D.
2NaW+X 2 =2NaX+W 2
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举一反三
【单选题】关于放射性活度的国际制单位,以下描述正确的是
A.
放射性活度的国际制单位是居里（Ci），1Ci=3.7× 10^10 Bq
B.
放射性活度的国际制单位是居里（Ci），1Ci=2.703×10^-11Bq
C.
放射性活度的国际制单位是贝可（Bq），1Bq= 3.7× 10^10 Ci
D.
放射性活度的国际制单位是贝可（Bq），1Bq= 2.703×10^-11 Ci
【单选题】听力原文：W: I need your help, John, I feel very nervous whenever speaking in the presence of many strangers. Do you know how to overcome this? M: Me too. Take it easy. I consider it a natural human respon...
A.
She should follow the human nature.
B.
Strangers are nothing to be afraid of.
C.
Feeling nervous is nothing improper.
D.
She should accept strangers' presents naturally.
【简答题】What is the most common form. of first contact between two people? In many cultures the most common form. of first contact between two people is a ______ .
【单选题】听力原文：W: I need your help, John, I feel very nervous whenever speaking in the presence of many strangers. Do you know how to overcome this? M: Me too. Take it easy. I consider it a natural human respon...
A.
She should follow the human nature.
B.
Strangers are nothing to be afraid of.
C.
Feeling nervous is nothing improper.
D.
She should accept strangers' presents naturally.
【简答题】无论总角度在什么位置,它必须是一个( )镜头,只有这一景别的镜头能够充分说明参与对话的人物关系以及这些人物和环境的关系 。
【简答题】bi r a. 有苦味的;苦的;很冷的
【单选题】I can't thank you _______ much because without your help I _______ have won the first prize.
A.
too; wouldn't
B.
very; shouldn't
C.
that; might not
D.
so; couldn't
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