D. The two groups walked at different speeds.

　　30. In the test, those who walked in a happy manner ______.

　　A. remembered more negative words

　　B. remembered more positive words

　　C. lived a happier life

　　D. lived a harder life

　　31. According to the story, the finding can help ______.

　　A. treat patients with depression

　　B. improve one’s acting skills

　　C. deal with people’s memory loss

　　D. change a person’s exercise habit

　　D

　　Air pollution, such as smog, has become a serious problem around the world. Besides wearing a mask, what else can we do to protect ourselves from the dirty air?

　　Scientists have developed a new inhaler (吸入剂) that can reduce the effect air pollution has on people. It could help millions of people who are suffering from air pollution, the Guardian reports.

　　This inhaler is developed by German company Bitop and contains a molecule (分子) named Ectoine. The molecule creates a layer (涂层) that protects lungs from polluted air. It’s reported that the inhaler will be affordable to most people when it comes to the market.

　　Air pollution kills more than three million people a year worldwide and leads to health problems like lung and heart disease and strokes, according to a 2015 research project in the journal Nature. It is also linked to brain disease, mental illness and diabetes (糖尿病).

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