Directions: The question below is followed by six choices numbered 260-265. If a choice is correct, mark T in the space provided. If a choice is not correct, mark F. Blacken one circle on your answer sheet for each number.

A client is diagnosed with gout. Which foods should the nurse instruct the client to avoid ？

Chocolate.（）

物质之间既相互联系，又存在某些规律，这是我们学好化学应该掌握的一种基本方法。请你仿照下表中的示例，找出O₂、CH₄、CO₂、NH₃、C₂H₄（乙烯）五种气体之间存在的另外两个规律，并排列出顺序，将答案填在下表中的空格内。