"I have received a lot of letters of support, all ______ me to focus on my music," said Liu Wei, who

was an armless pianist and named one of the show's winners in "China's Got Talent" competition. [      ]

A. encouraging  

B. encourage      

C. to encourage    

D. encouraged

下列对人和高等动物的生命活动调节的叙述中，正确的是

①激素调节是通过改变细胞的代谢而发挥作用的 ②激素调节的启动较慢，持续时间长 ③人和高等动物的生理活动，主要是通过激素调节来协调的 ④激素调节迅速而精确，反应时间短 ⑤冲动在突触间的传递是单向的 ⑥激素是参与体液调节的惟一化学物质 [ ]

A．②⑤　　　

B．①②⑤

C．④⑤⑥　　　

D．①③④⑤