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【多选题】
下列关于氟尿嘧啶的叙述正确的是A.
抗代谢物类抗肿瘤药物
B.
.白色或类白色结晶或结晶性粉末
C.
结构中有烯键,可使溴试液的红色消褪
D.
在稀盐酸或氢氧化钠溶液中不溶解
E.
又称5-FU
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【简答题】下面哪种方法沉淀出来的蛋白质具有生物学活性?A. 重金属盐 B.盐析 C.苦味酸 B. 常温下有机溶剂 E.强酸强碱
【单选题】The author uses the word 'euphemism' as an example to maintain that______.
A.
you can't understand the exact meaning of an unfamiliar word according to its surrounding words
B.
you can always guess the meanings of difficult words because of the context
C.
you express yourself in an indirect and less harsh way sometimes
D.
you can sometimes find clues to the meanings of unfamiliar words in their context
【简答题】Which of the following is not true? [A] Some people know little about the topic under discussion. [B] Some people do not know what the host is talking about [C] Some people do not know what the show i...
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