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盐酸普鲁卡因鉴别反应是
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硫酸镁中毒最早出现的中毒反应是
Section ADirections: This section is to test your ability to give proper answers to questions. There are 5 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you hear a question you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.
Task 1Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A), B), C)or D). You should make the correct choice and mark the corresponding letter on the Answer Sheet with a single line through the center. Packaging is a very important form of advertising. A package can sometimes motivate people to buy products. For example, a little child might ask for a breakfast food contained in a box with a picture of a TV character. The child is more interested in the picture than in breakfast food. Pictures for children to color or cut out, games printed on a package, or a small gift inside a box also motivate many children to buy products--or to ask their parents to buy for them. Some packages suggest that a buyer will get something for nothing. Food products sold in reusable containers are examples of this. Although a similar product in plain container might cost less, people often prefer to buy the product in a reusable glass or dish, because they believe the container is free. However, the cost of the container is added to the cost of the product. The size of a package also motivates a buyer. Maybe the package has "Economy Size" or "Family Size" printed on it. This suggests that the larger size has the most product for the least money. But that is not always true. To find it out, a buyer has to know how the product is sold and the price of the basic unit. The information on the package should provide some answers. But the important thing for any buyer to remember is that a package is often an advertisement. The words and pictures do not tell the whole story. Only the product inside can do that. What do you think is the best title for the passage
维生素B1的鉴别试验是
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