【单选题】In the space provided, write the letter of the sentence that best expresses the implied main idea of each of the following paragraphs. ____ 1 The earliest humans probably used the lengthening and shor...
A.
Throughout history, people have found better and better ways to measure the passing of time.
B.
The hourglass is a slightly more recent invention than the sundial.
C.
The first methods of measuring the passing of time took advantage of the changing shadows cast by the sun throughout a day.
D.
A primitive clock invented in about 1300 was the most exact way to tell time up to that point.