The Main Library has five floors open to the public. FOURTH FLOOR: Social Sciences & History. 300—399, 650—659, 900—999. Law books are shelved in a separate area—follow signs for the Law Library. THIRD FLOOR: Humanities. 100—199, 200—299, 400—499, 700—709 & 800—899. SECOND FLOOR: Science and Technology. 500—599. 600—649 & 660—699. FIRST FLOOR: Current (unbound) Periodicals. An information point is inside the Periodicals Office. GROUND FLOOR: Reference. General reference books and bibliographies.The Reference Librarians on each floor are available to answer queries during office hours. At other times you can ask at the Issue Desk, on the Ground Floor.Books are shelved according to size: normal size large size The shelves are color coded to help you identify them: RED Large books WHITE Normal size books YELLOW Large periodicals BLUE Normal size periodicals Books returned the previous day may be on the Recent Returns shelves, next to the Reference Librarians" desks

单选题 If you want to look up a word in a dictionary, which floor would you go to? ______.

单选题 What is the color code of the shelves where normal size novels are placed?

单选题 If you want to borrow books about American history, which floor would you go to? ______.

单选题 Out of office hours, if you have questions you should go to______.

单选题 If the book you want to borrow is about engineering and it was returned yesterday, you would probably get it______.