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【多选题】
一项有效的承诺必须符合的条件是（）。A.
承诺必须由受要约人作出
B.
承诺必须是对要约人作出
C.
承诺必须在要约有效的期限内作出
D.
承诺必须与要约的内容一致
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举一反三
【单选题】The author says that professional linguists recognize that ______.
A.
western languages are superior to Eastern languages
B.
all languages came from grunts and groans
C.
the hierarchy of languages is difficult to understand
D.
there is no hierarchy of languages
【单选题】The author says that cooked rattlesnake is______.
A.
tasty
B.
bitter
C.
healthful
D.
unappetizing
【单选题】The author says that cooked rattlesnake is ______.
A.
sickening
B.
healthful
C.
tasty
D.
unappetizing
【简答题】The author says he is not strong—minded enough to ignore the telephone because ．
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