What the science teacher does and says of great importance to college students.
A.are
B.is
C.were
D.was
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B解析试题分析：考查谓语动词单复数，句子作主语时，谓语动词用单数，句子意思“学科老师所做的和所说的对于大学生很重要”，所以选B考点：考查谓语动词单复数点评：句子What the science teacher does and says是个从句，引导词是what，做整个句子的主语，短语of great importance相当于一个形容词important。