题目：
The doctors say that good diet, exercise and fresh air, all of which _____ the health and long life.
A．lead to
B．refer to
C．stick to
D．contribute to
答案：
答案：D
考查动词词组辨析。contribute有助于，贡献；lead to“导致”；refer to“关于，涉及”；stick to“坚持”，根据句意“医生说适当饮食，锻炼及（呼吸）新鲜的空气，所有这些都有助于身体健康和长寿”，可知D最佳。
