题目

新疆的瓜果特别甜，是因为（    ） A.云量多，光照弱，利于作物的光合作用   B..昼夜温差大，营养物质耗费少，糖分积累多 C.降水少，瓜果水分含量少，糖分高   D.晴天多，云量少，温差不大，有利于作物的生长 答案：       B  The idea for the new plan came to his mind,         to his experiment in the lab.        A．while devoting        B．while devoting himself        C．while he was devoted      D．while devoted