4．What does the writer think of voice changes?

　　A．Natural.

　　B．Funny.

　　C．Unpleasant. D．Interesting.

　　解析：推理判断题。根据最后两段的内容可知，嗓音变化是青少年向成人过渡的生理发育的自然现象。

　　答案：A

　　B

　　(2017·山西省运城市教育检测)The average temperature around the world is rising. People living in the US Midwest might find a fact hard to believe, though. The scientists suggest that the change in the Midwest climate may have happened because of farming.

　　The first study was led by David Changnon, a climatologist (气候学家) at Northern Illinois University in DeKalb.Changnon and his team studied temperature records from the sites in the Midwest. They found that since 1970, the average temperature in the region during July and August has gone down — by up to one degree Fahrenheit (华氏度) — from what it was during the years between 1930 and 1969. Their investigation also showed that the average rainfall in those states during those two months has increased. Between 1970 and 2009, about 0.33 inches more rain fell than between 1930 and 1969.These_changes may be connected by humidity (湿度), Changnon says. Humidity is the measure of how much moisture is in the air.

　　Humid air, which contains a lot of moisture，takes longer to heat up than dry air, Changnon notes. And humid air often releases its moisture through rainfall.

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