[单项选择]Questions 26 to 28 are based on the passage you have just heard. A. Until he eats it. B. At least thirty minutes. C. All day. D. No more than thirty minutes.
参考答案:D 答案解析:[听力原文]26-28 When you have a dog it is necessary to care for it very carefully. In return you
第13题: [单项选择]小儿脊柱出现胸椎后凸在() A. 出生后2个月 B. 出生后3个月 C. 出生后6个月 D. 出生后8个月 E. 出生后10个月 参考答案:C 答案解析:出生后的第一年脊柱增长比下肢快,以后则落后于下肢。出生时脊柱无弯曲,仅轻微后凸。3个月小儿抬头时出现颈椎前凸(第一个生理弯曲),6个月小儿能坐时出现胸椎后凸(第二个生理弯曲),1岁小儿站立行走时出现腰