Bill: Hello, is that Dad?

Dad: Yes，it's me. How's your holiday? Are you having a good time in Sanya?

Bill: Yes. I'm collecting shells on the ____now. Where are you, Dad?

Dad: I am in the ____. I am ____a book.

Bill: Is Sally ____TV in the living room?

Dad: No. She is writing a ____in her bedroom.

Bill: OK. Miss you, Dad. Bye.

Dad: Bye.

制作人的口腔上皮细胞临时玻片标本时，刮取细胞的部位和在载玻片上滴加的液体分别是（  ）

微生物是一切肉眼看不见或看不清的微小生物、个体微小、结构简单的生物，统称为微生物，根据其结构分类，可以分为三类：____ 微生物，如细菌、蓝藻、酵母菌等；____ 微生物，如各种霉菌和多数的真菌；以及____微生物，如病毒、类病毒、朊病毒．

下列说法正确的是(    )