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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。

A. 对
B. 错

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类常量不能用public，protected，private，static修饰

A. 对
B. 错

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 __3means 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.

Dictation: listen to the audio and fill in the blanks.[音频]Creating a Marketing MessageWhat ___1_ are most companies trying to _2 with their marketing campaigns? Usually, they want more sales and more customers for their products. First, they need to 3 who their ideal customers are. Then they can focus on what will work for that audience.If you want to advertise a product, you need to think about 4. What should the ad look like? What kind of _5 will get people's attention quickly? What will _6_ the most new customers? You also need to think about your message. A simple message is often more successful than a 7_ one. Your advertising needs to have new 8_ and 9_ from other campaigns. If it re-uses old ideas and images, it won't get new people to _10___ your customer base.