问题
单项选择题
目前我国急性中毒发生最多的是（）中毒。
A、铅
B、硫化氢
C、苯
答案
参考答案：B
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目前我国急性中毒发生最多的是（）中毒。
A、铅
B、硫化氢
C、苯
参考答案：B
| 选择方框中适当的单词填空。 | |
Many people are 2.__________ when they find that the Internet was set up in the 1960s. At that time, computers were large and 3. _______________. Computer networks didn't work well. If one computer in the network broken down, then the 4. __________ network stopped. So a new network system had to be set up. It should be good enough to be used by many 5. _______ computers. If one be sent through another part. In this ways, computer network would keep on 6.___________ all the time. At first the Internet was only used by the government, but in the early 1970, universities, hospitals and banks were allowed to use it, too. However, computers were still very expensive and the Internet was 7.________ to use. By the start of 1990s, computers software that made" surfing" the Internet 8.___________. Today it is easy to get online and it is said that 9. _______ of people use Internet every day. Sending e-mails is more and more 10._________ among young people. |