把刻有"p"的载玻片放在显微镜下观察时，视野中所看到的应当是（  ）

国务院批准武汉城市圈为“全国资源节约型和环境友好型社会建设综合配套改革实验区”。这是国家大力促进中部地区崛起的重要举措，中部崛起是为了

根据上下文意思用所给单词的适当形式填空或者填入所缺单词。

    The Internet plays ____ important part in our daily life. But some people spend too much time online. This is a new disease. Doctors call it Internet Addiction Disorder (互联网成瘾症)(IAD). People with IAD spend hours ____ (talk) online or playing computer games. Many people with IAD spend ____ (much) time on the Internet than with family or friends. Some people with IAD even give up ____ (they) jobs! Do you have IAD? Think about the following ____ (question): How long are you online a day? Is it a lot or a little? Do you get angry ____ (easy) when you can't play a game? Nowadays, millions of people have IAD in the world. Doctors give people some advice. First, ask yourself "How long should I ____ (be) online today?" Then try your best ____ (take) a break. What's more, you can use the computer or play games ____ (two) a week, not every day. ____ this way, you can have a good life with other friends.

请认真阅读下列短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。
A
    If you travel by air across the center of Africa or South America, you fly over forests for thousands of kilometers. These great forests are the oceans of trees. There are full of thousands and thousands of different kinds of plants and animals.
    However, the world's forests are getting smaller all the time. We are cutting down the trees because we need wood, and we need more farm land. Some people say that there will not be any forests like these in 20 or 30 years. what will happen if they disappear?
    If we cut down our forests, a lot of plants and animals will disappear from the world. In a lot of places the new farm land will soon look like the old deserts. Crops will not grow there. It will not rain very often, and the weather will get very hot. Perhaps the climate of the world will change. This will be dangerous for everyone in the world. That is why we must take care of our forests.

下列说法正确的是(    )