题目

It may not rain, but you had better take an umbrella__________. A. in case     B. as well     C. as least     D. in need   答案：Ain case意为“以防万一”；as well意为“也”；at least意为“至少”；in need意为“需要”。下列各烃分别与H2完全加成，不能生成2,2 ,3—三甲基戊烷的是：        A．                         B．       C． CH2=CHC(CH3)2CH(CH3)2              D．