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【单选题】
下列有关蛋白质的描述哪正确的?A.
蛋白质分子的净电荷为零时的 pH 是它的等电点
B.
通常蛋白质的溶解度在它的等电点时最大
C.
大多数蛋白质在饱和硫酸铵中的溶解度增大
D.
由于蛋白质在等电点时溶解度大，所以一般沉淀蛋白质时应远离等电点
E.
以上各项全不正确
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【单选题】She loves staying in the village, _____ __ who are visiting her there.
A.
her friends loves
B.
her friends too
C.
her friend as
D.
so do her friends
【单选题】Erin Matson looked at her volunteer work at NOW as ____.
A.
a difficult task to complete
B.
a disappointing experience
C.
too easy for her ability
D.
a step closer to her goal
【单选题】Beatrice loves to draw apples. You can see ______ in her notebooks, on her letters, and even on her school bag! [ ]
A.
one
B.
others
C.
them
D.
which
【单选题】Erin Matson looked at her volunteer work at NOW as ____.
A.
a difficult task to complete
B.
a disappointing experience
C.
too easy for her ability
D.
a step closer to her goal
【单选题】大班 幼儿 的自我评价发展趋势是（ ）。
A.
从外部评价向内部评价发展
B.
从依从性、个别性评价向立性、多面性评价发展
C.
从具体评价向抽象评价发展
D.
从抽象评价向具体评价发展
【单选题】She loves staying in the village, ____ who are visiting her there .
A.
her friends loves
B.
her friends too
C.
her friends as
D.
so do her friends
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