听短文,判断正(T)误(F)。短文读两遍。 ( ) 1. The students were having biology class. ( ) 2. At first no one can answer Miss Li's question'What's water?' ( ) 3. Water has no color and no smell. ( ) 4. The water in the river behind the boy's house is clear. ( ) 5. The teacher thinks the water is getting dirtier and dirtier.