Galileo used mathematical calculation as well as observation of nature and was the first astronomer to use a telescope. With an instrument of his own 1._____ Galileo observed Jupiter and four of 2.______ moons, the phases of Venus and the spots on the sun. His 3._______ and calculations confirmed that Copernicus and Kepler were right. He saw 4._______ his own eyes and made other people 5._______ too that the earth was not the fixed center of 6._______ universe as Ptolemy had said. Galileo 7._______ made some important discoveries in mechanics. He did not 8.________ drop cannon balls from the Leaning Tower of Pisa 9._______ that all bodies fall at the 10._______ speed, but he did roll balls 11.________ a slope to show that the 12.__________ a body falls is proportionate 13._______ the square of the time it takes to fall. Galileo also noticed the regular 14._______ of the lamps in Pisa Cathedral; 15._______ gave him the idea of the pendulum, a device that enabled him to make the clock a scientific instrument for the first time.
1.
a. experiment
b. construction
c. calculation
2.
a. the
b. their
c. its
3.
a. observing
b. observations
c. observed
4.
a. by
b. from
c. with
5.
a. to see
b. see
c. seeing
6.
a. an
b. a
c. the
7.
a. instead
b. also
c. therefore
8.
a. as legend says
b. as stories say
c. as people say
9.
a. having proved
b. proving over
c. to prove
10.
a. same
b. equal
c. similar
11.
a. downside
b. down over
c. down
12.
a. track
b. distance
c. path
13.
a. to
b. of
c. with
14.
a. swings
b. swinging
c. swaying
15.
a. these
b. this
c. those
Answer
1-b
2-c
3-b
4-c
5-b
6- c
7-b
8-a
9-c
10-a
11-c
12-b
13- a
14- b
15-b
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