第一节：短文改错:（满分10分）

文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加： 在缺词处加上一个漏词符号（∧），并在此符号下面写出该加的词。

删除： 把多余的词用斜线（\）划掉。

修改： 在错的词下划一横线，并在该词下面写出修改后的词。

注意： 1．每处错误及修改均仅限一词；

2．只允许修改10处，多者（从第11处起）不计分。

Yesterday, I saw the old lady fall down when I was hurrying to school. I was about to help her up while suddenly a passer-by stop me, saying that I might be accused of knocking her down. Heard his words, I began to hesitate and slow down my steps. At the same time, another student, that saw everything, went up to help. The old lady said nothing but lots of thank to the good boy. I felt ashamed. As is known to all, help others is forever a good virtue. Even though some old people are becoming immorally, we can’t let it to disappear. I have made my mind that I will reach out my hand without hesitation next time.

纠正低钠血症的速度，第1个24h内不应超过（）。

A.6mmol/L

B.12mmol/L

C.24mmol/L

D.30mmol/L

E.40mmol/L