NO.PZ2017092702000119
问题如下：
Which of the following statements about hypothesis testing is correct?
选项：
A.The null hypothesis is the condition a researcher hopes to support.
B.The alternative hypothesis is the proposition considered true without conclusive evidence to the contrary.
C.The alternative hypothesis exhausts all potential parameter values not accounted for by the null hypothesis.
解释：
C is correct.
Together, the null and alternative hypotheses account for all possible values of the parameter. Any possible values of the parameter not covered by the null must be covered by the alternative hypothesis (e.g., H0: θ ≤ 5 versus Ha: θ > 5).
原假设和备择假设一起解释了参数的所有可能值。 原假设未涵盖的参数值必须由备择假设涵盖（例如，H0：θ≤5 与 Ha：θ>5）。
建立原假设和备择假设：我们想证明可能错了或者说此时已经不相信的就放原假设H0，我们（因为已经有证据的支持）想要证明的就放Ha。
BC请翻译并且通俗点解释（着实没有get到题目想考察啥）
