表示国界的符号是[ ]
A．A
B．B
C．C
D．D
答案：B
—Kate, do you know _______ it is from here to the gym?
—About twenty-minutes' walk. [ ]
A. How long
B. How far
C. How soon
D. How often
犬眼内压升高的疾病是（）
A、角膜炎
B、虹膜炎
C、结膜炎
D、青光眼
E、白内障
