Ⅰ.单项填空
1.(2021·天津卷)In the lab,keeping things clean and organized can help provide a safer .
A.system B.method
C.investment D.environment
2.(2021·天津3月卷)Currently,about 35,000 works in over 300 rooms in the Louvre,and it would take a lifetime to see everything.
A.were displaying
B.are displaying
C.were being displayed
D.are being displayed
