新托福考试阅读练习资料:罐装食品

2011-03-22

托福考试阅读

大多数人都知道,在挑选罐装食品时尽量避免挑到膨胀的那几罐,这其中包含了什么科学原理呢,我们的新托福考试阅读练习资料就会为大家进行解释。

 

新托福考试阅读练习资料

  Most of us are cautious eaters.

  If you’re munching grapes, you’ll probably skip one that’s all shriveled and discolored in favor of the round, healthy ones. Likewise, when you choose a can of food at the supermarket, you’ll likely choose one that’s exactly can-shaped, not one that’s misshapen and swollen.

  There's a good reason for this.

  A can of food can swell for two separate reasons. The first is what food scientists call “hydrogen swelling,” and it

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