At last they succeeded in out the maths problem.
Read and write. 根据提示写单词，将短文补充完整。
This is a ____ (大的) zoo. Look! There are ____ (六个) animals here.
Look! This is a ____ (猪) . It's so ____ (肥胖的). It's drinking____
(牛奶) now. How cute it is !
①对光时，阳光照在反光镜上，视野越亮越好
②在进行低倍物镜与高倍物镜的转换时，扳动物镜转动较省力
③使用完毕之后，要用干布拭去载物台上的水和脏物
④装箱之前应下降 镜筒，使物镜插入通光孔中
⑤取、放显微镜时，要左手托镜座、右手握镜臂，并且要轻拿轻放．
