单选题 Directions: In this section you will hear three short passages. At the end of each passage, you Mil hear mine questions. The passages and the questions will be, spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D. Then mark the corresponding letter on the ANSWER SHEET with a single line through the center. {{B}}Passage One{{/B}}

【正确答案】 D

【答案解析】[听力原文]21-24 A smart card is a secure, portable, tamper- resistant data- storage device. It is the exact size of a credit card and contains a computer with as much as power as the original minicomputers. Data stored in smart cards are accessed by placing the card in or near a smart card reader and providing the specific security access codes associated with the data desired. More than 70 million smart cards worth US $ 500 million were manufactured and distributed in 1996, and their use is doubling every year. The worldwide market for smart cards and associated smart card products and services in 1996 generated approximately US $ 2 billion in sales and is growing at the rate of about 20 percent per year. First developed in France in 1974, smart cards have since then attained various levels of sophistication, ranging from a simple prepaid card similar to a phone card, to portable electronic devices that may feature a keyboard and a liquid crystal display, like those used in GSM telephone subscriber. 21. Which of the following is not one of the features of smart cards?