1. 阅读理解

Doing experiments can be interesting, and you may try the following experiments at home. Make sure that you'll do them with an adult.

1. （1） How many experiments are there in the pictures?

   A . Six. B . Five. C . Three. D . Two.
3. （2） Which instructions is for "Step 2" in the Experiment A?

   A . Pour 3/4of the water away B . Pour some cool water into the bottle C . Pour some hot water into the bottle D . Let the air out of the bottle
5. （3） What can you see in the bottle at last in Experiment A?

   A . Some ice. B . Some ice and water. C . Some water. D . A cloud and some water.
7. （4） Which of the following ISN" T needed before these experiments?

   A . water B . Ice C . Cloud D . Balloon.
9. （5） In what class can you see these experiments?

   A . Biology B . Physics C . History D . Computer