题目

The newly-founded company is faced with lots of trouble, ____ the financial problem ia not the worst. A. which  B. of which  C. to whom   D. with which 答案：B 解析: 考定语从句。由从句中的短语the worst(of the trouble)判断出该定语从句应当用of which来引导。15．下列实验方案能达到实验目的是（　　）A．  探究空气中氧气的体积分数B．            证明碳具有还原性C． 证明金属锌的活动性比铁的活动性强D．证明燃烧的条件之一是需要氧气