单项选择题

A．they do not land there
B．there are not clouds at all
C．they can cross the ice with special equipment
D．it is very cold
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单项选择题
A．Sub-standard form of the English language.B．An ideal form of English pronunciation.C．A standard form of English pronunciation among intellectuals.D．A somewhat standard form of English pronunciation in English.
A．Sub-standard form of the English language.
B．An ideal form of English pronunciation.
C．A standard form of English pronunciation among intellectuals.
D．A somewhat standard form of English pronunciation in English.
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