单项选择题

Since the (21) of the National Environmental Policies Act in 1969, the United States Congress, legislature at the federal level, has (22) a series of laws designed to prevent the air and water pollution and to (23) noise. At the same time, legislatures at the state (24) have also been active in this area, and many states have laws that are similar to the federal laws. (25) ,a state law must not conflict with a federal (26) or (27) an unreasonable burden on interstate commerce.
The city of Burbank in California adopted an ordinance (28) the nighttime takeoffs of jet aircraft between 10 p.m and 7 a.m. Lockheed owned and operated the Burbank Airport. It (29) Brubank to prevent the enforcement of the ordinance.
The judgment is (30) Lockheed. The federal government of the United States has passed laws (31) aviation and noise in the federal Aviation Act of 1958 and the Noise Control Act of ]972. Such legislation preempted the field and (32) state action, because (33) regulations would place an unreasonable burden on interstate commerce. If each airport had its own landing time (34) , it would be very difficult to plan flights. Moreover the bunching of flights to (35) local curfews would produce even greater noise and would increase the danger of (36) by increasing traffic (37) . From the nature of aviation (38) , a single national control was essential. As a local regulation, the (39) prohibiting nighttime takeoffs adopted by the City of Burbank was (40) declared illegal.

21().

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