预防误吸和吸入性肺炎的措施有（） A.术前禁食禁饮 B.胃管吸引或机械催吐 C.使用

阅读下面的文字，仔细揣摩画线句子的特点，仿写两个句子。

　　时光如水，生命如歌。在历代浩如烟海的文学作品中，生与死是最丰富、最悲壮、最动情的话题。人世间的所有悲欢冷暖和人生的全部感悟，尽皆包含其中。有“生当作人杰，死亦为鬼雄”的豪迈悲壮，有“侬今葬花人笑痴，他年葬侬知是谁”的断肠凄婉，______________________，______________________。

气割用的氧气瓶是（）。

A、压缩气瓶

B、溶解气瓶

C、液化气瓶

D、低温气瓶

D

A sunflower is a sunflower . A mobile phone is a mobile phone . But can you combine the two to do something for your local environment?

As early as next year it may well be possible. When you have finished with your mobile phone you will be able to bury it in the garden or a plant pot and wait for it to flower. A biodegradable (能进行生物递降分解的) mobile phone was, this month, introduced by scientists.

Scientists have come up with a new material over the last five years. It looks like any other plastic and can be hard or soft, and able to change shape. Overtime it can also break down into the soil without giving out any toxic chemicals. British researchers used the new material to develop a phone cover that contains a sunflower seed. When this new type of cover turns into waste, it forms nitrates (硝酸钾). These feed the seed and help the flower grow. Engineers have designed a small transparent window to hold the seed. They have made sure it only grows when the phone is thrown away. "We've only put sunflower seeds into the covers so far. But we are working with plant experts to find out which flowers would perform best. Maybe we could put roses in next time," said one scientist.

As phone technology is developing so quickly people are constantly  throwing their mobiles away. This means manufacturers are under pressure to find ways of recycling them. Some 650 million mobile phones have been sold this year. Most of them will be thrown away within two years, adding plastic, heavy metal and chemical waste to the environment. A biodegradable cover can offer some relief for nature, according to the scientists. "The seed is released and the flower grows in the pot so you don't have to concern yourself with the phone when you have finished using it," said Kerry Kirwan. She leads the research team, which is based at the University of Warwick in Britain.

67. The main idea of the passage is ________ .

A. the relationship between high tech and environment

B. the phone technology is developing

C. how to grow sunflowers

D. mobile phone and environment

68. The purpose of introducing a biodegradable mobile phone is ______ .

A. to encourage consumers to recycle

B. to prevent consumers from throwing their phones away

C. to meet consumers’ need

D. to help consumers know which flower can best perform

69. What is the possible meaning of the underlined word ?

A. pleasant    B. poisonous    C. useful    D. new

70. Which of the following statements is NOT true ?

A.Engineers have designed a small transparent window to hold the rose seed .

B. Mobiles with biodegradable covers can do good to nature .

C.Manufacturers are under pressure to find ways of recycling mobiles .

D. The flower only grows when the phone is thrown away .

比较并说明PLC与微机（MC）的区别和联系。

电动机温度过高为什么会被烧毁？