【正文】
60。【分析】答案是B?!癳ach of+復數(shù)名詞”作主語時,謂語動詞單數(shù)?!癳very(no,each,many a)+單數(shù)名詞+and+every(no,each,many a)+單數(shù)名次”作主語時,謂語動詞用單數(shù)。如:Every desk and every chair in the classroom is new.教室里的每張桌椅都是新的。,在數(shù)學四則運算中,謂語動詞一般用單數(shù)。如:Three times six is 。Three and five equals 。