乙醇的分子结构模型如下图所示，则下列叙述正确的是

A．乙醇是由三种元素组成的化合物          

B．一个乙醇分子中含 有10个原子

C．乙醇中碳、氧元素的质量比为2：1        

D．乙醇中氢元素的质量分数最大

―I'm considering returning home. I just can't get used to the food here.

―Take it easy.       _______.

A．Storms make trees take deeper roots.

B．East or west, home is best.

C．From small beginning come great things.

D．All things are difficult before they are easy.