Which of the following is caused by the earth’s turning around the sun?

A．The rising and setting(落下) of the sun and moon.

B．The change of spring, summer, autumn and winter of the year.

C．The change of the day and night.

D．The time in the east is earlier than that in the west.

100÷25，当被除数扩大10倍时，商也扩大10倍．______． （判断对错）