By improving reading skills, you can read faster and understand more of you read．
A. that
B. what
C. which
D. whether
网友回答
A. that
(答案→)B. what
C. which
D. whether
解析：考察从句连词的选择。根据句子结构可知，该句是of后面的宾语从句，从句中缺少read的宾语，因此选择what，that在从句中不作成分，which用于有范围的选择 D意为是否，在从句中不作成分。