Why did the author's aunt try to teach her children to speak Korean？
A. To help her improve her Korean language skills.
B. To help them establish a Korean identity.
C. To help them succeed in the U. S.
D. To help them find a good jo
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下列关于酶催化反应机理的方面的描述中，不正确的是()。
A. 底物和酶的临近效应与定向效应与催化有关
B. 共价催化与催化有关
C. 底物形变和诱导契合与催化有关
D. 酸碱催化与催化无关
Adders are most likely to be found______.
A. in shady fields in England
B. on uncultivated land throughout Britain
C. in Scotland and nowhere else
D. in wilder parts of Britain and Ireland
嘧啶核苷酸生物合成时，先合成CMP，再由CMP合成UMP。()
A. 正确
B. 错误
Based on the ideas presented in the passage we can conclude "being fat" ______in American
A. will always remain a taboo
B. may no longer be a taboo some day
C. has long been a taboo
D. is not considered a taboo by most people
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