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Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. Who warned the police about the fire

A fireman.
B. A workman in the forest.
C. A car driver.
D. A truck driver.

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Questions 26 and 27 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions. Now, listen to the news. According to the news, which of the following powers was NOT given to the security forces

A. The complete banning of marches and rallies.
B. The detention of people without charge.
C. The maintenance of order by using necessary force.
D. The right to search premises without a warrant.

"What does the middleman do but add to the price of goods in the shops " Such remarks are aimed at the intermediate operations between manufacturers and final customers. This practice usually attracts a lot of attention from the public and the press and the operation most talked about is what is often called wholesaling. The wholesaler buys goods in large quantities from the manufacturers and sells them in smaller parcels, to retailers, and for this service his selling price to the retailer is raised several percent higher. But his job is made more difficult by retail demand not necessarily running level with manufacturer’s production. Because he adjusts or regulates the flow of goods by holding stock until required, he frees the manufacturer, to some extent, from the effect on production of changing demand and having to bear the whole risk. The manufacturer can then keep up a steady production flow, and the retailer has no need to hold heavy stocks, who can call on the wholesaler for supplies any time. This wholesale function is like that of a valve in a water pipe. The middleman also bears part of the risk that would otherwise fall on the manufacturer and also the retailer. The wholesaler provides a purely commercial service, for which she is too well rewarded. But the point that is missed by many people is that the wholesaler is not just someone adding to the cost of goods. It is true one could eliminate the wholesaler hut one would still be left with his function: that of making sure that goods find their way to people who want them. What function of the wholesaler is compared to a valve

A. Pushing up demand from retailers.
B. Controlling the flow of goods.
C. Bearing part of the risk for manufacturers.
D. Selling goods to retailers.

血清前清蛋白测定方法( )

A. 双缩脲法
B. 溴甲酚绿法
C. 连续检测法
D. 醋酸纤维膜或琼脂糖电泳法
E. 免疫比浊法

催化转录生成hnRNA的酶是

A. RNA聚合酶Ⅰ
B. RNA聚合酶Ⅱ
C. RNA聚合酶Ⅲ
D. 核酶

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