Environmental reasons for slow growth of green leafy vegetables in continuous rainy weather

This question is too stolen and the teaching materials are not good. Let me explain something to you.

You didn't examine the questions carefully. Note that it is rainy, not cloudy. Carbon dioxide enters plants through the surface of leaves. On rainy days, there will be rain on the surface of the blade, and co2 is not easily soluble in water. Rainwater becomes a membrane between co2 and leaves, which leads to insufficient co2 supply for plants.

The answer is bcd, which pays too much attention to choosing words and has no effect on cultivating students' ability.