the blood moved with a backward and forward motion.

　　Early in the 17th century a new instrument came into use

　　that was to open up a whole new area in the study of medical and sicentific matter

　　this was the microscope.

　　The first instruments were not very efficient.

　　They were able to magnify only a very small part of the object

　　and this was always surrounded by rings of coloured light.

　　Nevertheless a great step forward had been taken

　　which was of vital importance for future research and development.

　　14. What was the unfortunate thing mentioned in the passage?

　　15. What did William Harvey find out in 1628?

　　16.What instrument gave a great help to the study of medical and scientific matters?

　　Passage Three

　　One way that scientists learn about man is by animals

　　such as mice, rats and monkeys

　　the scientists in this laboratory are experimenting on mice

　　they are studying the relationship between diet and health.

　　At this time over one hundred experiments are going on in this laboratory.

　　In this experiment,the scientists are studying the relationship

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