--What kind of ________ makes 3G cellphones so popular with the young?
--Video communication, I think.
A．markB．signC．symbolD．feature
D
考查詞義辨析。mark標記，sign 符號，symbol 象征，feature特征，句意：哪種特征使3G手機在年輕人中如此的受歡迎。我認為是視頻交流。所以選D。
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