问题
单项选择题
β受体阻滞剂，可用于治疗心律失常的是( )。
A．盐酸普萘洛尔
B．氯贝丁酯
C．硝苯地平
D．甲基多巴
E．卡托普利
答案
参考答案：A
解析：盐酸普萘洛尔为β受体阻滞剂，临床上用于心绞痛、窦性心动过速、心房扑动及颤动等。
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β受体阻滞剂，可用于治疗心律失常的是( )。
A．盐酸普萘洛尔
B．氯贝丁酯
C．硝苯地平
D．甲基多巴
E．卡托普利
参考答案：A
解析：盐酸普萘洛尔为β受体阻滞剂，临床上用于心绞痛、窦性心动过速、心房扑动及颤动等。
| 阅读理解。 | ||||||||
| You're in a bit of a dilemma standing in front of the produce section of your local supermarket. In one hand, you're holding a conventionally grown Granny Smith apple. In your other hand, you have one that's been organically grown. Both apples are firm, shiny and green. Both provide vitamins and fiber, and both are free of fat, sodium and cholesterol. The conventionally grown apple costs less and is a proven family favorite. But the organic apple has a label that says "USDA Organic". Does that mean it's better? Safer? More nutritious? Several differences between organic and non-organic foods exist. Become a better informed consumer for your next trip to the supermarket. The word "organic" refers to the way farmers grow and process agricultural products, such as fruits, vegetables, grains, dairy products and meat. Organic farming practices are designed to encourage soil and water conservation and reduce pollution. Farmers who grow organic produce and meat don't use conventional methods to fertilize, control weeds or prevent livestock disease. Here are other differences between conventional farming and organic farming:
The U.S. Department of Agriculture (USDA) has established an organic certification program that requires all organic foods to meet strict government standards. These standards regulate how such foods are grown, handled and processed. Any farmer or food manufacturer who labels and sells a product as organic must be USDA certified as meeting these standards. Only producers who sell less than $5,000 a year in organic foods are exempt (免除) from this certification. If a food bears a USDA Organic label, it means it's produced and processed according to the USDA standards. The seal is voluntary, but many organic producers use it. | ||||||||
| 1. The main purpose of the passage is ______. | ||||||||
| A. to promote the sales of organic food B. to inform people organic food is better for their health C. to persuade people to become informed consumers D. to compare conventional and organic foods | ||||||||
| 2. According to the passage, organic farming is intended to _____. | ||||||||
| A. improve the quality of the soil and water B. take the place of the traditional agriculture entirely C. adopt eco-friendly methods to grow plants and feed animals D. prevent livestock from getting disease more effectively | ||||||||
| 3. According to the passage, the conventionally grown apple ______. | ||||||||
| A. costs less but tastes worse than an organic one B. doesn't look the same as an organic one C. has proven itself acceptable by the family D. contains more fat, sodium and cholesterol | ||||||||
| 4. Which of the following methods belongs to organic farming? | ||||||||
| A. Using chemicals to kill insects and prevent disease. B. Using rotted plants as fertilizer to promote plant growth. C. Using growth hormones to speed up animals' growth. D. Using insecticides to reduce insects and disease. | ||||||||
| 5. From the passage we know the organic certification program _______. | ||||||||
A. is not meant for all producers of produce |