﹣ Mom, ______ I visit the art museum next Monday?
﹣ I'm afraid you can't. All museums in the city are closed on Monday.
R/Ω
5
10
15
20
25
30
P/W
2.6
2.4
2.2
2
1.8
1.6
①实行郡县制 ②开凿大运河 ③大规模修建长城 ④创立科举制度
下列说法中正确的是( )