单项选择题

Questions 11-13 are based on the following monologue introducing the library. You now have 15 seconds to read Questions 11-13. How do librarians keep b6oks in order

A．They arrange the books in alphabetical order.
B．They put the books into a card catalogue.
C．They give a number to each book.
D．They put the books on the shelves.
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单项选择题
What is remarkable about the black walnut tree outside Brett Hall
A．Its leaves are yellow.
B．Its leaves are lopsided.
C．It is very tall.
D．It is not an angiosperm.
单项选择题
What are the officials puzzled at now
A．How to restore the normal production of the oil wells.
B．How to estimate the losses caused by the fires.
C．How to remove the oil left in the desert.
D．How to use the oil left in the oil lakes.
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