The word "ambiguous"(line 1, para. 3)most probably means "______".
A. understandable
B. multi-faceted
C. uncertain
D. alternative
某市经预测2005年社会商品购买力总额为24600万元，商品可供量是11200万元，计算商品供求差额、商品供求比率、商品供求差率。
According to the text, when might communication difficulties arise？
A. When the messages sent do not fit the social norms expected by the receiver.
B. When there is mutual distrust between the involved parties.
C. When the parties involved strongly desire interaction.
D. When the parties involved fail to use nonverbal cues.
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