下列数据为常见水果的近似pH,其中酸性最强的是( )
A.菠萝pH=5.1B.苹果pH=4.1C.柠檬pH=2.5D.柿子pH=8.5
Class is over. It’s time ______ you ______ a rest.
Ty to sing more English songs , and you will find it interesting _______ a foreign language.
We all need partners _______.
The river is too wide for the swimmers _______________.
I am happy with my old friends today.