真菌
参考答案：是一类不能进行光合作用，细胞形态通常是丝状，细胞壁中含有几丁质，有无性和有性生活史，主要靠孢子繁殖的真核微生物。
用am, is, are填空
1. Excuse me! ________ this your eraser?
2. What ________ those? ________ they birds?
3. This ________ his ruler. Where ________ my ruler?
4. I ________ in Class Three. ________ you in Class Three, too?
5. ________ these her English books?
6. Those ________ their apples. Where ________ his apples?
7. She ________ eleven. How old ________ that boy?
8. He ________ my friend. ________ your friend a boy or a girl?
9. ________ those maps? No, they ________ not. They ________ pictures.
10. These ________ your bananas. Here you ________.
砌筑拱圈石料及水泥砂浆等级有哪些规定？
