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
between the amount of food the mice eat and their health.
The mice are in three groups.
All three groups are receiving the same healthy died
But the amount of food that each group is receiving is different
The first group is eating one cup of food each day,
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