Do you have a room? I have a room. It is very beautiful. I clean it everyday. This is my room. It is not very big. There is a picture on the wall. There are some books on the desk. The dog is on the floor, and it is sleeping. Where is my sister? Oh, she is under the desk.

根据课文将正确的答案写在横线上。

把字换一个偏旁，成为本课的生字。

破——____         礁——____

I don't like ____ (get up) early every day.

一个由中美科学家组成的联合研究小组，通过给蚊子注射一种细菌，使其与蚊子形成稳定的共生关系，使蚊子具有抗疟原虫的免疫能力，且这种免疫能力能传给后代。从理论上讲，这将导致携带疟原虫的蚊子越来越少，有助于从根本上遏制疟疾。上述事例说明（    ）

①科技进步正改变着自然界的客观性

②人能利用规律创造条件造福人类

③人类能创造出世界上不存在的物质

④人类能够能动地认识和改造世界

小华到新华书店购买一套丛书，该丛书八五折销售（即按原价的85%销售）比打九折销售时少3元钱，那么这套丛书的原价是____元．