氯贝丁酯可发生异羟肟酸铁盐反应,这是因为分子中具有()
A.酯键
B.酚羟基
C.芳伯胺
D.不饱和键
E.酰胺键
参考答案:A
—Don’t you feel surprised to see Bruce at the meeting ?
—No. I really didn’t think here .
A.he has been
B.he had been
C.he would be
D.he would have
—How do you like vinegar?
—________. [ ]
A. Salty
B. Sour
C. Spicy
D. Sweet