A．By pausing.B．By raising pitch.C．By lowering register.D．By pointing to a chart.
A. By pausing.
By raising pitch.
C. By lowering register.
D. By pointing to a chart.
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A．A halo.B．A sunspot.C．A sun dog.D．A rainbow.
A halo.
B. A sunspot.
C. A sun dog.
D. A rainbow.
Where did Mr. Holloway buy the clothing？
At Last Sports Shop.
B. South Street Sports Shop.
C. The shop recommended by the school.
A．Smaller circles.B．Bands of color.C．A large white disc.D．Curved legs of light.
A. Smaller circles.
Bands of color.
C. A large white disc.
D. Curved legs of light.
盐析法沉淀蛋白质的原理是()。
A. 破坏水化膜，中和电荷
B. 无机盐与蛋白质结合成不溶性的蛋白盐
C. 降低蛋白质溶液的介电常数
D. 破坏蛋白质的一级结构
E. 调节蛋白质溶液的等电点
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