题目

光合作用实验中，若将叶的主脉切断，一切按规范操作，则发现叶片先端遇碘液未变蓝色，原因是（   ） A．叶片无法支撑                                        B．气孔不能开闭 C．缺水无法生成淀粉                                 D．叶片未遮光 答案：C根据所给音标和句意，在答题卷标有题号的横线上，写出空缺处各单词的正确形式。每空只写1个词。1.Let’s leave her a to meet us at the gate of the zoo．2.What do you want to read about in your daily newspaper?3.Look !The boy lying on the is my cousin，David．4.Tom lives one floor me，we are neighbours．5. your bicycle before you ride．