There is good and bad news about trees. The good news is there are so many trees on earth. Scientists thought we had 400 billion trees, but we have far more trees on earth. It is a three with 12 zeroes. For each person, there are 420 trees.   

The bad news is that we once had more trees. It was a six with 12 zeroes. We lost half of the trees. Europe was once a very big forest. Now it is fields and cities. We lose 15 billion trees each year. Scientists said we must do our best to make forests healthy again. 

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1.There is good and bad news about______.

A food

B trees

C students

D water

解析：选B。细节理解题。根据第1段第一句There is good and bad news about trees.可知，故选B。

2.Scientists thought we had 400_____trees.

A hundred

B thousand

C million

D billion

解析：选D。细节理解题。根据第1段第三句Scientists thought we had 400 billion trees,…可知，故选D。

3.How many trees does a person have now?

A 12

B 15

C 240

D 420

解析：选D。判断推理题。根据第1段最后一句For each person, there are 420 trees.可知，故选D。

4._____make forests.

A Cities

B Fields

C Trees

D People

解析：选C。常识题。根据常识，我们知道森林由树木组成，而不是人口、城市或者田地，故选C。

5.Which is “a three with 12 zeroes”?

A 3000000000

B 30000000000

C 300000000000

D 3000000000000

解析：选D。数字计算题。根据题意为：数字3后12个0，故选D。