Nowadays people are convinced ___ the negative effect of Wap版

试题详情及答案解析

Nowadays people are convinced ___ the negative effect of second-hand smoking ___ people around.

A．of; at	B．by; in
C．of; on	D．on; at

答案：C

试题分析：考查介词短语。句意：现在人们确信二手烟对周围人的副作用。be convinced of确信；effect影响，作名词，后跟介词on。故C正确。
考点：考查介词短语