—My good friend Tom, together with his classmates, 　　　 going to visit Shenzhen.

—Will he phone you as soon as he 　　　　 here?

A．are; arrives

B．are; will arrive

C．is; arrives

D．is; will arrive

ADP对磷酸果糖激酶的激活作用属于酶的（）。

A．酶原激活

B．反馈抑制调节

C．化学修饰调节

D．别构调节

E．磷酸化修饰调节