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植物最低的光照强度应该（）。

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光饱和点和光补偿点表示植物对（）的利用能力。

According to Will Pidcroft, the writer of this text, can English be mastered within a very short period of time? Does he provide any evidence to support his view?

Does he support the idea that a language is best learned where it is spoken?

What is the belief held by behaviorists in terms of language learning?