TELLING TIME
6.The best tittle of the selection is ______________________________________.(critical)
a.The uses of clocks
b.why people need to tell time
c.ways of telling time:Then and Now
d.comparing the different types of clocks

7.Which of this sentence is a topic sentence?(critical)
a.the invention of the clock 600 yrs Ago was the first accurate measurement of time
b.hourglass contained sand that fell trough one container to another.
c.long ago people used simple tools such as the hourglass.
d.humans have used different objects to tell time.​