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问题 选择题

身高160cm的小明，利用自己的身体特征进行了以下估测，接近真实值的是（　　）

A．教室宽5臂展，约8m（臂展：两臂左右平伸时，两手中指尖之间的距离）

B．教室长10步幅，约30m（步幅：走路时，两脚尖之间的距离）

C．课桌长4拃，约2.8m（拃：张开手，拇指尖到中指尖之间的距离）

D．物理课本厚1指宽，约10cm

答案

答案：A

A、教室的宽一般接近10m；故8m符合生活实际；故A正确；

B、教室的长度一般在15m左右，达不到30m；故B错误；

C、单人课桌长在1m以内，双人课桌长在1.5m左右，不会达到2.8m；故C错误；

D、物理课本厚约1cm，达不到10cm；故D错误；

故选A．

选择题

图中a、b、c分别为赤道、回归线和极圈，d表示极点，箭头为地球自转方向，回答下题：下列说法，不正确的是（　　）

A．c线以内为寒带

B．b线上的点一年有两次太阳直射

C．a线上的点一年有两次太阳直射

D．d点周围所有方向均为南
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完形填空

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