我敢肯定你不想再听一遍过量摄取糖份的危害了。
I'm sure you don't need another lecture on the dangers of excess sugar consumption.
第二种情况，你需要再听一遍，争取有所进步，然后再查阅里面的单词习语，扫清障碍。
Second, you need to listen again, to strive for progress, and then check the words idioms inside obstacles.
如果你所说的听力课本中的课文有录音，首先听录音，尽量在第一次听时多听懂些，然后再听一遍，同时你可以默读。
If you have recordings of texts (the listening comprehension books you mention), first listen to the recordings, trying to pick up as much as you can at first hearing.
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