题目内容
（请给出正确答案）
Coalescence(聚合) is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and ______in size.
A.expand
B.extract
C.increase
D.decrease
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【填空题】Fill in the blanks with what you hear. Baby tigers are very cute.That is why some people want to 1 one. Today, there are about 2 pet tigers in the U.S. But there are only 3,200 tigers in the 3 in Asia! People with pet tigers usually keep them in their backyards. This is a bad idea. Keep in mind that tigers are 4 animals. They need big homes. They need a lot of room to run, play, and 5 . Tigers can also be dangerous. An angry tiger can 6 and hurt a person. People really need to think twice about keeping tigers as pets.
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