一、阅读理解。
第一节阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
A
HasifaNakaziba, a mother of seven, has relied on farming corn and beans to support her family for years. But each year she would lose 30% of her harvest as pests affected her grain, taking their share of the food before it reached the dinner table.
