单项选择题

Questions 9 to 12 are based on the conversation you have just heard.

A. An alternative use of fuel oil.
B. A way to make fuel oil less polluting.
C. A new method for locating underground oil.
D. A new source of fuel oil.
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单项选择题
B
单项选择题
A. Because the library assistant thinks he has an overdue book. B. Because the books he needs have been checked out by someone else. C. Because the library assistant is unable to locate the books that he needs. D. Because a library notice was sent to him at his previous address.
A. Because the library assistant thinks he has an overdue book.
B. Because the books he needs have been checked out by someone else.
C. Because the library assistant is unable to locate the books that he needs.
D. Because a library notice was sent to him at his previous address.
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