The solution to this problem is Little

本讲为2005年下半年新的教学内容，请对照教材听录音！       I heard him _sing_ (sing).       I don’t like letters _written_ (write) in pencil.       Such programs could teach the local people how __ (select__ (export)       the environment needed for the survival1 of the many rare species2 of animals and plants, as well as of the Indian tribes3 that live in the rainforest, could be preserved.       The local people could also be taught to earn more money by cutting the selected trees and making them into furniture on the spot.          people in the richer countries of the world could also help save the rainforests by using wood-derived products such as paper more carefully and by recycling used paper products to help reduce the demand for newly cut wood.       The solution to this problem is   Little Less   Lessen

1 survival   

n.留住生命，生存，残存，幸存者

参考例句：

• The doctor told my wife I had a fifty-fifty chance of survival.医生告诉我的妻子，说我活下去的可能性只有50%。
• The old man was a survival of a past age.这位老人是上一代的遗老。

2 species   

n.物种，种群

参考例句：

• Are we the only thinking species in the whole of creation?我们是万物中惟一有思想的物种吗？
• This species of bird now exists only in Africa.这种鸟现在只存在于非洲。

3 tribes   

n.部落( tribe的名词复数 )；（动、植物的）族；（一）帮；大群

参考例句：

• tribes living in remote areas of the Amazonian rainforest 居住在亚马孙河雨林偏远地区的部落
• In Africa the snake is still sacred with many tribes. 非洲许多部落仍认为蛇是不可冒犯的。 来自《简明英汉词典》