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Once talented young blacks have left Watts, they are not expected to return home and

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下列关于关键酶的叙述，不正确的是

A. 一般位于代谢途径的起始或分支处
B. 催化单向不可逆反应
C. 活性较低，活性最低者又称为限速酶
D. 是可调节酶
E. 无重要生理意义

下列分子中能产生紫外吸收的是

A. Na2O
B. C2H2
CH4
D. K20
E. NaCl

conservative means being opposed to great or sudden change.()

According to one rock music critic, the teenagers express their rebellious attitudes