题目

   根据短文内容, 选出五个句子填入文中空缺处,使短文内容完整正确。有两项是多余的。 1   four classes in the morning and two in the afternoon. Their morning classes begin at eight o'clock and finish at a quarter to twelve.  2   They seldom(很少) eat out or eat at home. After lunch they don't have a rest.   3    and school is over at twenty to three. After school they don't go back home at once(立刻).They usually do some sports at school. Most of the students like playing basketball. Some of them like playing the piano. Some like reading根冠内能分泌一种激素，并且能主动地向根尖的伸长区运输，与分生区分泌的低浓度IAA的作用相反，与增强植物的抗逆性有关．深秋时节若对玉米根冠作以下四种处理．请根据激素相互作用共同调节的特点判断四个根尖可能向左弯曲的是（　　） A、AB、BC、CD、D