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Tears are nature's way of making us feel more comfortable. When our eyes are made uncomfortable by some small pieces of pollution, or when we are cutting onions(洋蔥), or when we are exhausted and have "red -eyes" from overwork and late hours, tears form in our eyes to clean and refresh them.

Tears are also a sign of strong emotion. We cry when we are sad and we cry when we are happy.

And tears seem to be uniquely(唯獨)human. We know that animals also experience emotions-fear, pleasure, lone-

liness-but they do not shed tears. From this, we can conclude that tears are closely related to the emotional and biological make-up of the human species.

Biologically speaking, tears are actually drops of saline fluid, which is a little bit salty, produced by a gland(腺) in the body. Because salt is an important component, tears may actually constitute the most conclusive evidence that the human animal is the end product of a long evolutionary process that began in the sea.

And it is clear that, in addition to the emotional benefits, the shedding of tears has a specific biological function as well. Through tears, we can eliminate from our body certain chemicals which build up in response to stress and create a chemical imbalance in the body. Crying actually makes us feel better by correcting that imbalance and making us feel good again. And thus the emotional and the biological functions of tears merge(合并) into one and make us even more "human" than we would otherwise be.

4. Which of the following is NOT a function of tears?

A. Biological. B. Emotional.

C. Political. D. Chemical.

5. Which of the following is the best title of the passage?

A. Tears Are a Sign of Strong Emotion

B. Tears Make Us Feel More Comfortable

C. Tears Are Salty

D. Tears Have a Certain Biological Function

4. C。第三段和最后一段即本題答案出處。 5. B。短文開頭的第一句即本文的主題句,即全文的中心思想,也就是本文的題目。

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