题目

One of a lawyer's tasks is to _________ legal guidance to people in need but a certain __________ of fee is charged. A . supply; number B . provide; deal C . ask for; amount D . offer; amount 答案：D在探究“菜青虫取食行为”的实验中，要从卵开始隔离饲养，其原因是（　　） A、观察菜青虫的个体发育过程B、证明菜青虫是危害十字花科蔬菜的重要害虫C、提高证明菜青虫喜欢取食十字花科蔬菜是先天性行为的可信度D、为了与成虫菜粉蝶的取食行为作对照