The following chapters provide step-by-step instructions for practical _______ of genetic (基因)engineering to agriculture.

   A. applications           B. organization         C. expression       D. attention

The following chapters provide step-by-step instructions for practical _______ of genetic (基因)engineering to agriculture.

1. A.
   applications
2. B.
   organization
3. C.
   expression
4. D.
   attention