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问题
单项选择题
变性蛋白质的主要特点是
A．黏度降低
B．溶解度增加
C．不易被蛋白酶水解
D．生物学活性丧失
E．呈色反应减弱
答案
参考答案：
D
选择题
The reason ______ he changed so much was ______ he had to work hard to pay back the money his father borrowed.
A. for; that
B. why; that
C. why; because
D. for; because
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单项选择题
尿嘧啶用下列哪个英文字母表示（）
A.G
B.U
C.T
D.C
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