四六级考试

【单选题】 The study published in the journal Nature indicates that ______.
A．the Clean Air Act has not produced the desired results
B．lead deposits in arctic snow are on the increase
C．lead will stay in soil and snow longer than expected
D．the US is the major source of lead pollution in arctic snow

【单选题】 Tomorrow the mayor is to ______ a group of Canadian businessmen on a tour of the city.
A．coordinate
B．cooperate
C．accompany
D．associate

【单选题】
A、Sunday morning, 11 o’clock.
B．Thursday morning, around 10 o’clock.
C．Friday morning, around 10 o’clock.
D．Monday morning, 11 o’clock.

【单选题】 Susan gave him a book as a going-away token ______ for his assistance during her stay in this department.
A．in return
B．in regard
C．in memory
D．in favour

【单选题】 MDC Company believes that its customers are satisfied because the company ______.
A．gives them opportunities to order
B．provides good service and quality
C．guarantees the quickest delivery
D．sends new catalogues to them