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【单选题】
关于二维凝胶电泳的双向电泳以下描述正确的是（ ）A.
第一蛋白质电荷差为基础，第二蛋白质分子量差异为基础
B.
第一蛋白质分子量差异为基础，第二蛋白质电荷差为基础
C.
两向电泳基础不定，可以任选
D.
两向电泳基础相同，只是方向不同
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【简答题】现代汉民族共同语以______为基础方言。
【单选题】Man: Excuse me, Miss. Do you know where I can find file holders? Saleswoman: You see the kitchenware there? _____.
A.
Then you'll surely see file holders.
B.
Stationery is just one file after that.
C.
Pens and pencils are together with file holders.
D.
It's somewhere nearby.
【单选题】Man: Excuse me, Miss. Do you know where I can find file holders? Saleswoman: You see the kitchenware there? ______
A.
Then you'll surely see file holders.
B.
Stationery is just one isle after that.
C.
Pens and pencils are together with file holders.
D.
It's somewhere nearby.
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