29. ________that the government can lead them out of the financial crisis, people are optimistic about the future of the country.

A．Convincing

B．Convinced

C．To convince

D．Having convinced

某牛场10%的牛发生羞明、流泪、痉挛，有浆液性或脓性分泌物，角膜混浊，血管增生，有的病牛出现角膜溃疡，体温40.5-41.5℃，精神沉郁，食欲不振。

最可能发生的疾病是（）。

A、外伤性角膜炎

B、传染性角膜炎

C、化学性角膜炎

D、结膜炎

E、青光眼