小李同学为了宣传安全用药，草拟了四条宣传标语．其中不恰当的是（   ）

—Your sister nearly _________ all her spare time to her study during the three years.
—That’s right, or she _________ the first place in her school in the College Entrance Examination.

如图，△ABC中，BC=8，AD是中线，将△ADC沿AD折叠至△ADC′，发现CD与折痕的夹角是60°，则点B到C′的距离是（ ）

在制备抗蛇毒毒素血清时，需将减毒的蛇毒注入家兔体内，引起免疫反应，这一免疫反应和所用的蛇毒分别是（    ）

A _______ to a problem is a way of dealing with it so that the difficulty is solved.