【单选题】The measure of a man's character is what he would do if he knew he would never be found out. ——Thomas Macaulay Some thirty years ago, I was studying in a public school in New York. One day, Mrs. Nanet...
【单选题】Four specific activities have been identified as major contributors to the desertification process: overcultivation, overgrazing, firewood gathering, and overirrigation. The cultivation of crops has e...
A.
Lack of proper irrigation techniques
B.
Failure to plant crops suited to the particular area