下列物质中,属于纯净物的是()
A:纯净水
B:硬水
C:井水
D:自来水
(____)1. Let me clean the window.
(____)2. Look! The bird is on the light.
(____)3. There isa picture on the wall.
(____)4. The book is near the computer.
(____)5. The bag is on the chair.
A. B. C.
D. E.
一袋盐重500克,两袋这样的盐重____克。