D．Ask your doctor for advice.

　　答案　B　[从文中的第三、四段和最后一段可知。]

　　46．Why is jogging so popular according to the passage?

　　A．It doesn't cost much.

　　B．One can start jogging at any time and in any place.

　　C．It is a very good exercise.

　　D．One can talk with one's friend while jogging.

　　答案　C　[由第一段可知。]

　　47．The author doesn't think that everybody is fit for jogging. Which paragraph deals

　　with it?

　　A．Para. 1.

　　B．Para. 2.

　　C．Para. 3.

　　D．Para. 4.

　　答案　C　[由第三段可知。]

　　D

　　WASHINGTON—Extreme heat that has been baking much of the US Midwest and East Coast has eased on July 9，with rain and cooler temperatures reported in those parts of the country，while reports indicated the death toll of the heat wave has climbed to 74.

　　With cooler air swept southward in the eastern half of the country，the temperature has dropped from around 100 degrees Fahrenheit over the past two weeks to about 90 in most parts of the Midwest to the East Coast. In Washington，Monday was the first cool day after 11 days of sustained heat，with highs at 84 degrees.

　　The relief began on Saturday night，as thunderstorms led to the cooler temperatures. In New Jersey，a line of strong，fast­moving storms knocked out power to nearly 70,000 on Saturday night.

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