英格豪斯的实验结果说明光合作用的条件是____ ．科学家们的研究结果说明光合作用的原料是____，产物是____ ．

已知函数f（x）=$\left\{\begin{array}{c}\left|x+1\right|,x\le 0\\ \left|{\log }_{2}x\right|,x>0\end{array}\right.$，若方程f（x）=a（a∈R）有四个不同的解x₁，x₂，x₃，x₄，且x₁＜x₂＜x₃＜x₄，则（x₁+x₂）x₄的取值范围是____ 

    Have you ever planted a few trees on Tree Planting Day? Each year, millions of people, both 1 , plant a lot of trees. But this may not be the best way to make your home a 2 place.

    Last week we visited a park in Hebei. We were 3 to find most of the trees had been burned. The workers told us that the trees 4 soon after they were planted because they weren't watered well enough. 5 workers burned them and cleaned the place for 6 trees to be planted this year. 7 a card found in one of the dead trees, a student wrote,“ I hope this tree will grow up with me to 8 the backbone (栋梁) of our country.” The workers said that the survival(存活) of the trees was really more important than 9 trees were planted.

    Some people in Beijing now have a new idea that they can donate (捐赠) some money and let professionals (专业人士) plant and 10 the trees.