第5题: [单项选择]缺钙对小儿的影响是() A. 性早熟 B. 牙齿黑染 C. 骨质疏松 D. 生长障碍 E. 佝偻病 参考答案:E 答案解析:含激素的营养剂如蜂皇浆可致性早熟;含铁食物可致小儿牙齿黑染;缺钙对成人可引起骨质疏松而对小儿则引起佝偻病;长期应用肾上腺皮质激素和苯妥英钠可致骨骼脱钙和生长障碍。
第6题: [单项选择]The sky was so clear in fact that the communications crew and recovery team could watch the balloon______ to its maximum altitude with the naked eye. A. hike B. elevate C. escalate D. ascend 参考答案:D 答案解析:[解析]语义连贯题。气球的上升是缓慢地、逐渐地,ascend 指物体逐渐或继续上升。[A] hike作不及物动词时意为“升起”,尤指从某处升起,如 My coat had hiked up in th