目前我国致盲的首位原因是
A．糖尿病性视网膜病变
B．青光眼
C．沙眼
D．白内障
参考答案：D
There _______ some milk and bread on the table. You can have them _______ breakfast. [ ]
A. are; for
B. are; in
C. is; for
D. is; in
根据花相理论，连翘、金钟花是属于（）。
A.密满花相
B.团簇花相
C.覆被花相
D.线条花相
