视网膜中央动脉阻塞的临床特征是()。
A.一眼突然发生无痛性完全失明
B.常见视网膜出血
C.樱桃红斑
D.视网膜动脉变细
E.视网膜混浊水肿
参考答案:A, C, D, E
— Excuse me, what time is it now?
— Sorry, my watch____. It ___at the shop. [ ]
A. isn't work; is being repaired
B. doesn't work; is being repaired
C. isn't working; is repaired
D. doesn't work; is repaired
下列农作物在明代引进的有
①玉米②甘薯③占城稻④马铃薯⑤花生[ ]
A.①②③④
B.②③④⑤
C.①②④⑤
D.①③④⑤