下图为高等动物体内甲状腺活动的调节示意图，请据图回答：

（1）图中①表示_________激素。

（2）③表示_________激素。

（3）切除甲状腺，血液中①和②浓度将会_________。这种调节特点属于_________调节。

All of the tickets for two real estate seminars, F and G, were either purchased or given away, and the ratio of F tickets to G tickets was 2 to 1. Of the total number of F tickets and G tickets, what percentage was purchased ？（）
(1)The total number of F tickets and G tickets is 240.
(2)Of the F tickets, exactly 60 percent were purchased, and of the G tickets, exactly 80 percent were purchased.

A．条件(1)充分，但条件(2)不充分．

B．条件(2)充分，但条件(1)不充分．

C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．

D．条件(1)充分，条件(2)也充分．

E．条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．