某口袋中有红色、黄色、蓝色玻璃共72个,小明通过多次摸球试验后,发现摸到红球、黄球、蓝球的频率为35%、25%和40%,估计口袋中黄色玻璃球有( )个。
18
_______ enough is quite necessary for your health, so you shouldn’t stay up too late every day.
A.Sleep
B.Sleeping
C.To sleep
D.Having slept
家畜类脱水制品干制最适宜的季节是夏季。( )