题目内容
感染性微生物的危险度等级分为几类？
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I级生物安全柜100%气流外排，II级生物安全柜30%气流外排，70%气流进入内循环。
Modern technology has a big influence on our daily life. New devices are widely used today. For example, we have to __(1)___the Internet every day. It is becoming more and more __(2)____ to our nearly everybody. Now it is time to think about how the Internet influences us. What ___(3)___it has on our social behavior.The internet has totally _____(4) our life, there is no doubt about that I think that the Internet has changed our life in a ____(5)way.
After driving for 30 miles,she suddenly _______that she is driving in the wrong direction.
Last week he said that the sun always ________ (rise) from the east.
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