食品污染可分为()。
A.生物性、物理性、放射性
B.生物性、化学性、放射性
C.生物性、有机性、化学性
D.有机性、物理性、化学性
E.生物性、有机性、放射性
参考答案:B
If you have trouble pronouncing the word, you can repeat it over and over again _______ you are comfortable with it.
A.unless
B.if
C.until
D.while
They kissed goodbye, then she________him and ran away, disappearing in the distance.
A.broke down
B.broke away from
C.broke into
D.broke off