下面短文共有10处语言错误，每句话最多有两处，每处错误仅涉及一个单词的增加、删减或修改。

增加：在缺词处加漏词附（∧），并在下面写上该加的词；

删除：把多余的词用斜线（\）划掉；

修改：在错词下面划一横线，并在该词下面写出修改后的词。

Students today should do more reading. Indeed, the importance of reading can never be very stressed. First of all, reading, especial out-of-class reading, enrich our mind and broadens our horizons. Through reading, we learn what can’t be learnt in our classrooms. Beside, reading is also a way of relaxation. This is very refreshing to read a story before going to bed, or after a day of the study. There were many famous sayings about reading, like “Reading is to the mind that exercise is to the body.” Then how can we develop the habit of reading? In the first place, I believe we should start from an early age, then stick on it and never give up. Secondly, we should read what we are interested and also what is proper for us.

设随机变量X服从正态分布N(μ，1). x₁，x₂，…，x₁₀。是取自总体X的10个样本值，在显著性水平为α=0.05下检验：

H₀：μ=0；H₁：μ≠0.

拒绝域为.

求c。