62．C　推理判断题。文章第一段描述对孩子的视力进行实验，接下来用鼓来对孩子的听力继续实验。所以选C。

　　63．D　推理判断题。纵观文章，这是一篇医学实验报告，所以选D。

　　C8 [2017·浙江卷] ----B

　　Below is a selection from a popular science book.

　　If blood is red, why are veins(静脉) blue?

　　Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it's outside the body, when it's sitting in a vein near the surface of the skin, it's more of a dark reddish purple colour. At the right depth, these blood－filled veins reflect less red light than the surrounding skin, making them look blue by comparison.

　　Which works harder, your heart or your brain?

　　That kind of depends on whether you're busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But, in the long run, your brain probably tips it, because even when you're sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it.

　　Why do teeth fall out, and why don't they grow back in grown－ups?

　　Baby(or“milk”) teeth do not last long; they fall out to make room for bigger, stronger adult teeth later on. Adult teeth fall out when they become damaged, decayed and infected by bacteria. Once this second set of teeth has grown in, you're done. When they're gone, they're gone. This is because nature figures you're set for life, and what controls regrowth of your teeth switches off.

【2017届河北省高考英语阅读理解一轮限时训练（4）】相关文章：

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（10）附答案

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练：2（含解析）

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（39）附答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (74)

★ 2017届高考英语二轮复习课时训练：23（含解析）

★ 四川省2016届高考英语一轮复习课时作业（48） Module6 The Tang Poems 外研版选修8

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练十

★ 浙江省湖州市2014高考英语阅读理解一轮（暑假）精炼（17）含答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (83)

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (40)