题目

    某科学小组为研究该激素在植物体内运输方向进行了如下图所示的实验。初始时，球脂块①〜⑥都不含该激素。实验结果发现①②③④琼脂块中都含有该激素且数量上①>②、③=④；⑤⑥琼脂块并没有该激素。 25据实验现象推测该激素在植物体内运输方向是               。 26分别说明①>(D、③=④的原因可能是                       。When changing lanes, a driver should use his turning signal to let other drivers know _________ .A．he is entering which laneB．which lane he is enteringC．is he entering which laneD．which lane is he entering