(单选题)

How does the plant’s protective system working according to Lang?

A.By timing the exposure to daylight.

B.By adjusting sunlight plants receive.

C.By being positioned under proper shades.

D.By switching between strong and weak lights.

参考答案：B

参考解析：

细节理解题。该题可定位到第三段第三句“When the plant senses the light, it gets rid of extra energy and creates more leaves. When the plant is in shade, the protective system is turned off.”从该句可知，当植物感受到光的时候，它会去除多余的能量，并产生更多的叶子。当植物处于阴凉处时，保护系统关闭。所以该保护系统会根据光的多少来自我调整。故选B。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语