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.
单项选择题
A．in warm airB．in cold airC．when it reaches the polar regionD．only when the clouds are down low
A．in warm air
B．in cold air
C．when it reaches the polar region
D．only when the clouds are down low
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