气候对人类活动的影响表现在（　　）

①农业生产方面；②水利建设方面；③城市建设方面；④交通和工程建设方面．

已知向量$\overrightarrow{a}$=(cosx-sinx,2cosx)，$\overrightarrow{b}$=(cosx+sinx,sinx)$\left(x\in R\right)$，则函数f(x)=($\overrightarrow{a}$$·$$\overrightarrow{b}$)²-1是（　　）

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    A poor farmer had a friend ____was famous for the wonderful apple tree he grew.    

    One day, his friend ____(give) the farmer a young apple tree and told him to plant it. The farmer was pleased with the gift, but he did not know where____(plant) it.    

    He was afraid that if he planted the tree near the road, strangers would steal the fruit. If he planted the tree in one ____his fields, his neighbors would come at night and steal some of the apples. If he planted the tree near his house, his children would take the fruit.____(final) he planted the tree in his wood. But ____(with) sunlight and good soil (土壤),the tree soon died.    

    Later the friend asked the farmer why he had planted the tree in such____ poor place. "What's the ____(different)? " the farmer asked____(angry). The friend answered, "If you planted the tree in the sunlight, at least ____could enjoy the fruit. Now you not only have robbed everyone of the fruit, but also you have destroyed (毁掉) a good apple tree !"