甲乙物体都做匀速圆周运动，甲球的轨道半径是乙球的2倍，在1min内甲球转动次数是乙球的1/2，则两球的加速度之比是（    ）

单词拼写，根据句子中所给的单词首字母或中文提示，填写正确的单词。

(1)Doing the boring work all day is really going to d____ me mad.

(2)My brother's favorite TV p____ is Running Man, but I like Animal World.

(3)The young man hoped to a____ his dream by working hard.

(4) It's polite for a young man to give his s ____ to the old on the bus.

(5)Our teacher gave us some v____advice on how to learn English well.

(6)Mom, one ____(调羹)of salt is enough for the soup.

(7)Cindy is very interested in Chinese ____ (历史).That's why she came to China.

(8)Our English teacher is very____ (严格的) with us.

(9)You need to ____ (检查)carefully for spelling mistakes after writing.

(10)Can you help me ____ (翻译)this English poem into Chinese?