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19.What does the Gallery feel sorry for?（ ）
A.Visitors have to keep their valuable items in the checkrooms.
B.The size of visitor items allowed into the Gallery is limited.
C.It cannot keep oversized visitor items due to limited space.
D.Visitor items over 17×26 inches must go through additional checks.
20.Parents with small children visiting the Gallery .
A.can carry their children in soft front child carriers
B.can carry their children on their shoulders
C.can carry their children in child carriers worn on the back
D.ought to pay if they want to use pushchairs for their children
21.Visiting photographers should make sure that .
A.pictures and videos are allowed for personal use anywhere in the Gallery
B.tripods are allowed except in some special exhibitions
C.picture-taking and videoing are totally forbidden in the Gallery
D.pictures and videos can be taken in some places for personal use
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