听力原文:W: Have you ever put a computer together before?
M: NO, never. But I think if we follow these instructions exactly, we won't have much trouble.
Q: What are the speakers going to do?
(19)
A.Check their computer files.
B.Make some computations.
C.Study a computer program.
D.Assemble a computer.
第1题
两分子黄酮衍生物聚合而成的二聚物是
A.二氢黄酮醇
B.查耳酮
C.花色素
D.双黄酮
E.黄烷醇
第3题
随pH不同而改变颜色的是
A.黄酮醇
B.二氢黄酮和黄烷醇
C.花色素
D.查耳酮
E.黄酮及其苷
第4题
与2’-羟基查耳酮互为异构体的化合物是
A.二氢黄酮
B.黄烷醇
C.花色素
D.二氢查耳酮
E.异黄酮
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