题目内容
类常量使用define()函数定义。
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符号“::”被称为静态访问符，访问静态成员都需要通过这个操作符来完成。
类常量不能用public，protected，private，static修饰
Dictation: listen to the audio and fill in the blanks.[音频]Water from the Sky: Too Much or Not Enough?"How much rain did we get?" It's a question we often hear, and its an important one because all life on Earth depends on (1) ___________. As long as our part of the world gets the usual (2) ____________ of rain, we're happy.The problems come when we get too much rainfall or not enough. In southern China, for example, June of 2016 was a month of (3) ____________that brought far too much rain. The rain caused (4) ____________in much of the area. Three hundred people were killed, and 700,000 acres of farmland were underwater.That same spring, very little rain fell in parts of India. That caused a (5) ______________in the state of Telangana. The terrible conditions (6) _____________food crops, which couldn't grow without water. Drinking water supplies dried up as well. More than a quarter of India's population was affected.The problems are different when the (7) _____________is cold. Then it's the amount of snowfall that matters. In February of 2016, a huge snowstorm hit the resort island of Jeju in South Korea. It was the biggest snowfall there in several decades.Because rainfall is so important to us, scientists called meteorologists try to (8) _____________the amount of rainfall different parts of the worid will receive. To do this, they (9) _____________air and ocean temperatures. They also watch weather conditions around the world to see how the air is moving.Meteorologists then make weather (10) _______________to let us know how much rain to expect. They're not always exactly right, but they do know when well probably have large amounts of rain or not enough.
Dictation: listen to the audio and fill in the blanks.[音频]Climate ChangeWhile the weather changes from day to day, the word climate refers to a common weather ____1___ over a long time. Lets look at how the earth's climate is changing.Higher Average TemperaturesAlthough some days are warm and some are cool, the earth's ____2___ temperature is higher now than in the past. This ____3____means some plants can now ____4____ in places that used to be too cold, but the higher temperatures have negative effects as well.Melting IceMuch of the world's water is in the form of ice—polar ice at the north and south poles and glaciers in high mountain areas. With higher average temperatures, much of that ice is ____5_____. Where there used to be glaciers, we now see bare ground high in the mountains _____6____.Stronger StormsThe world's oceans are also ____7_____warmer than in the past. This means that the right conditions ____8____ for stronger storms, especially hurricanes and typhoons.Rising Sea LevelsWhen polar ice and glaciers melt, more water enters the world's oceans and sea levels ___9____. This means that islands and areas of low land along a country's ____10___ may soon be underwater.
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