问题
单项选择题
关于骶骨脊索瘤CT表现的描述，错误的是（）。
A.溶骨性破坏
B.囊实性混杂密度，可有钙化
C.增强扫描肿瘤轻度至中度强化
D.易于转移瘤鉴别
E.向外生长形成软组织肿块
答案
参考答案：D
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关于骶骨脊索瘤CT表现的描述，错误的是（）。
A.溶骨性破坏
B.囊实性混杂密度，可有钙化
C.增强扫描肿瘤轻度至中度强化
D.易于转移瘤鉴别
E.向外生长形成软组织肿块
参考答案：D
All of my students I taught at Saint Mary’s School in Morris, Minnesota were dear to me, but Mark was one in a million. His happytobealive attitude made even his occasional naughtiness 31 . Mark talked 32 in class. I had to remind him again and again that talking without 33 was unacceptable. What impressed me so much, though, was his sincere response every time I had to correct him for misbehaving, “Thank you for correcting me, Madam!” I didn’t know what to make of it at first, but before long I became 34 hearing it many times a day. However, one morning my patience was 35 when Mark talked once too often. I warned Mark, “If you say one more word, I am going to tape your mouth 36 !” It wasn’t ten seconds later when Chuck blurted out（脱口说出）, “Mark is talking again.” I hadn’t asked any of the students to help me 37 Mark, but since I had stated the 38 in front of the class, I had to act on it. Taking out a roll of masking tape from the drawer of my desk, I walked to Mark’s desk, 39 two pieces of tape and made a big X with them over his mouth. I then returned to the 40 of the room. As I glanced at Mark to see how he was doing, he winked at me naughtily. That he did so funnily! I started 41 . The entire class 42 as I walked back to Mark’s desk, 43 the tape, and shrugged my shoulders. His first words were, “Thank you for 44 me, Madam!” Several years passed until one cold rainy day when my father broke the news to me that Mark was killed in Vietnam War, I broke down and cried in my heart, “Mark, I would give all the masking tape in the world 45 you could talk to me!”
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