单项选择题
A. Broadcasting frightened sounds of the birds to scare them away. B. Making shooting sounds to scare the birds away. C. Hiring special workers to drive them away. D. Capturing them and then transporting them away.
A. The shorter hours they work, the higher pay they can enjoy. B. The more they work, the less leisure they can enjoy. C. The shorter hours they work, the less pay they can get. D. The greater pressure they bear, the unhappier they can he.
A. gained the least weight B. were inclined to eat less C. found their vigor enhanced D. were less susceptible to illness