题目内容
CO2浓度提高时，光饱和点随之（ ）。
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植物最低的光照强度应该（ ）。
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?
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