填空题“being”改为“be”

单项选择题A．six, more than 100B．two, more than 200C．two, more than 100D．six, more than 200

单项选择题A．wheat, soybeans, carrot and lettuceB．soybeans, tomatoes, carrot and wheatC．white potatoes, carrot, lettuce and soybeansD．wheat, soybeans; lettuce and white potatoes

填空题“does”改为“do”

填空题“before”改为“ago”