I'll ___ to ironing after I've finished the washing.
A.get around
B.get about
C.get through
D.get over
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Mr. Brown said that he would ___ us to have dinner together this weekend.
A.call on
B.call off
C.call for
D.call up
We ___ the boat by the bank.
A.fastened
B.tied
C.bound
D.moored
血浆蛋白质的等电点大多为pH5-6，它们在血液中的主要存在形式是
A. 带正电荷
B. 带负电荷
C. 兼性离子
D. 非极性分子
E. 疏水分子
有一蛋白质溶液，各种蛋白质的等电点分别为7.8、6.5、3.6、5.4、4.9，电泳时欲使其中四种蛋白质涌向负极，缓冲液的pH应该为
A. 7.0
B. 8.0
C. 5.2
D. 6.0
E. 4.3
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