（）废除九品中正制度，正式开科取士。
A.杨坚
B.杨广
C.李世民
D.武则天
参考答案：A
It was getting dark, but the little boy didn’t know______________.
A．who can he ask for help
B．what was wrong with the bike
C．where can he go to mend the bike
D．if he could arrive home on time or not
人感染H7N9禽流感重症患者病情发展迅速，多在5-7天出现重症肺炎，体温大多持续在（）以上，呼吸困难，可伴有咯血痰。
A.37.5℃
B.38℃
C.38.5℃
D.39℃
