二岁以下儿童肠梗阻常见的病因是（）
A.嵌顿性斜疝
B.先天性肠道闭锁或无肛
C.先天性肠旋转不良
D.急性肠套叠
E.胎粪性腹膜炎
参考答案：D
单句改错。
1. How much percentage of his income is taxable (可纳税的)?
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2. An increasing percentage of the population owns their own cars.
3. The most percentage of the people are against the plan.
论述创新型人才培养与教育创新的关系。
