试题题干
Fill in the blanks with one of the items given below:
It is estimated that native
pollination of flower and vegetable cropsworth 1.2 billion dollars a year.
参考答案
正确答案：![]()
Fill in the blanks with one of the items given below:
It is estimated that nativepollination of flower and vegetable cropsworth 1.2 billion dollars a year.