【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Too much metal in the soil is considered pollution. Yet too little metal in a p...
A.
clean polluted soil and cure disease like cancer
B.
clean up harmful waste materials in soil and improve people's diet
C.
produce large number of micronutrients such as iron and zinc