增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

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). 每处错误及其修改均仅限一词；

2). 只允许修改10处，多者（从第11处起）不计分。

    Last Friday, Just before the 66^th National Day holiday, I conducted interview with James Watson, a famous American scientist, talk about how to become a successful scientist. On his opinion, to be a scientist, we needed to be very fond of science. What's most, we have to keep practicing as well as learn from other successful scientist. If we want to be a successful one, besides hard-working, we are supposing to set up for a clear goal as well. James Watson also suggest that every child who is curiously about science should make your effort to realize the dream of becoming a scientist.

一个直角三角形有两条边长为3，4，则较小的锐角约为（　　）