----Look! ________a high probability that their team will win.

----Yes, the members are cooperating so well.

A．It is

B．It was

C．There was

D．There is

黑热病的流行特点有（）

A.本病发病无明显季节性

B.不同地区发病年龄有所不同

C.本病为地方性传染病

D.犬源型及自然疫源型以儿童多、成人少

E.人源型以较大儿童及青壮年发病多