Learning Task 4:Choose the letter of the correct answer.


_____1.Who discovered the principle of gravity?

a.Edwin Hubble
b.Isaac Newton
c.Albert Eintstein
d.Isaac Lewton


_____2.The greater the distance between masses,the_____is the gravitational attraction.

a.greater
b.smaller
c.farther
d.more


3.It is the measurement of Earth's pull an object.


a.Mass
b.Weight
c.Distance
d.Force



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