题目

阅读下面材料，根据其内容完成后面各项任务。     Thousands of years ago，people didn’t know why sometimes the moon is full and sometimes it is crescent（弯曲）shaped，and even sometimes it can’t be seen at all．The moon was a great mystery（谜）to them．They made up stories about the great light in the night sky．They thought there was a god up there who was in charge of（掌管）the moon。They called the god，“Moon God”．       In fact the moon is the Earth’s satellite（卫星）．Many planets have a satellite，and some have many．Our 根据消化系统图，回答下列问题：（1）[5]是________，它能分泌胆汁．（2）含有消化液种类最多的消化器官是________________，它是消化道最长的部分，是消化食物和吸收营养物质的主要场所．（3）图中属于消化道外的消化腺是________________、________________、________________．（4）从图中可以看出，消化系统包括________和消化腺两个部分．