关于磁敏感加权成像的叙述，正确的是（）
A.是一种梯度回波序列
B.包括三维采集、完全流动补偿、高分辨力和薄层重建技术
C.可充分显示组织之间内在的磁敏感特性的差别
D.对小静脉的显示有独到的优势
E.主要用于MRA中动脉血管的显示
参考答案：A, B, C, D
解析：由于对脱氧血红蛋白等顺磁性成分敏感，因此，对小静脉的显示有独到的优势。而动脉血液主要为氧合血红蛋白呈反磁性，所以不能用于动脉血管的检查。因此，E是错误的。
Bill, a thirteen-year-old boy, thought he had grown up to be a man. But his parents told him, “ You won’t be a real man until you begin to_1_____ helping others.” One morning, his parents gave him some money to 2____ some milk for them. Outside a shop he saw a homeless old man who looked very 3____. Bill went to him and asked, “ What’s wrong with you?” The old man answered, “ I’m hungry. I haven’t had any food for two days.” All the thought of his parents’ words, Bill said to the old man, “Let’s go to the 4_______.” When they got there, Bill asked the waiter to bring out bread and coffee to the old man. The old man finished the meal quickly. After the waiter 5_____the plate and the cup, the old man said, “Sorry for give you too much6_____. I’m fine now. I’ll 7____ forget your kindness! You are a very good young man” Bill was 8______ when he heard this. Just when he wanted to pay for the meal, the waiter came. Bill and the old man learned 9______ that he food was free 10___ it was the birthday of the boss, and they were the first customer(顾客) that day.
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