C．its image falls on the blind spot

　　D．your left eye is not open

　　47. In which order should the first experiment be done?

　　a．Hold the card.

　　b．Move the card nearer.

　　c．Close your right eye.

　　d．Write two English letters on the card.

　　e．Look at the letter “R”．

　　f．Make a card.

　　A．d.f.a.b.c.e.

　　B．a.c.f.d.e.b.

　　C．f.a.d.c.b.e.

　　D．f.d.a.c.e.b.

　　48. The first passage mainly tells us

　　.

　　A．there is a blind spot in the eye

　　B．an interesting experiment

　　C．where the blind spot is

　　D．how to find the blind spot

　　49. How many things at least are used in the second experiment?

　　A．Three.

　　B．Four.

　　C．Six.

　　D．Seven.

　　50.What’s the conclusion of Experiment Two?

　　A.The string helps the ice mel.

　　B.The heat around the ice helps melt.

　　C.Put enough salt to melt ice or snow,or they will be freeze again.

　　D.The ice melts with the help of the weather.

　　D

　　When you’re curious about something, and want to know more about it, you can use the way of asking questions. Asking questions is the first step to make discoveries(发现) and find interesting answers. The steps below can guide you during the research.

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