B
Now in some places of our country, many people are cutting down (砍伐) the trees in the forests. They need more       to build houses and more farmland to grow crops and so on. The areas of forests are getting      . Some scientists say that there       no big forests in 20 or 30 years. It is really a(n)     thing.       ______the forests, we will have sandstorms (沙尘暴) often. The weather will get      . The earth will become a big desert (沙漠). A lot of plants and animals will     . Crops will not grow anywhere. Life will be       for everyone.
So we should do our best       our living environment and keep our mountains      , the water clean, and the sky blue.

A．wood B．money C．deserts D．leaves

A．bigger and bigger B．less and less C．smaller and smaller D．more and more

A．has B．have C．will have D．will be

A．excited B．happy C．better D．terrible

A．With B．Under C．Within D．Without

A．wet and cold B．hot and dry C．cold and dry D．hot and wet

A．come B．live C．die D．turn

A．difficult B．easy C．enjoyable D．poor

A．protect B．to protect C．protecting D．protected

A．clear B．fresh C．green D．blue