1.When the students take a trip on the intra coastal-waterway system next month, they will learn facts with which they have heretofore been unacquainted.
Right!
点评：倒装语句，其实在这种状况下无妨。但也有多个类似题目大家可以在平时发掘，实在不行就死记。且有being在句中的选项经常是错的。
2. Even though California is smaller than Alaska or Texas it has a far larger population.
Texas, California has by far the largest population.
点评：首先防止Run-on。其次注意到Alaska和Texas中间是“or”，所以代词“it”的指代对象需要说明，将它直接换成“California”。
3. In June, Juile was certified in CPR and aquatic rescue, and she has been working as a lifeguard ever since.
Right!
点评：这也是一种题型，死记吧。。。某人在做完某事后一直做某事：sb has been working as…ever since…
4. One of the most unusual animals in the world, eggs are laid by the platypus, which is also a mammal.
the platypus is a mammal that also lays eggs.
点评：platypus是动物，不是人，不能用Who，同时将被修饰成分和修饰语放在一起。
5. The unique culture of Cork is primarily founded by its great musical and lyrical traditions.
Cork has a unique culture founded primarily on
点评：又体现了最好还是用顺叙这个原则。
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