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  3. A branch of the National Academy of Sciences reported Wednesday that federal safety regulators lack of the expertise to monitor

A branch of the National Academy of Sciences reported Wednesday that federal safety regulators lack of the expertise to monitor

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问题     A branch of the National Academy of Sciences reported Wednesday
that federal safety regulators lack of the expertise to monitor vehicles with 1.______
increasingly sophisticated electronics.
    In a widely anticipated study, the group called off the National Highway Traffic 2.______
Safety Administration to add technical help, refine its investigative techniques and
push for automakers to install "black boxes" that record data in car crashes. It also
recommends that the federal agency form an advisory panel of specialists who can 3.______
assist both in regulatory reviews or specific vehicle investigations. 4.______
    With electronics systems becoming more complex, the agency needs
"gain a stronger understanding" of both the hardware and computer software 5.______
that automakers are installing in their latest models, the group said.
    National Academy of Sciences was asked to review procedures at 6.______
N.H.T.S.A. after the agency’s investigation of unintended acceleration
of Toyota vehicles and a possible link to electronic-control systems. The
Japanese automaker recalled more than eight millions vehicles worldwide 7.______
in 2009 and 2010 to fix sticky accelerator pedals or replace faulty floor
mats that Toyota had claimed could cause intended acceleration. 8.______
    In a statement, the safe agency said it had "already taken steps to strengthen 9.______
its expertise in electronic control systems", but added that it would review the
recommendations by a committee of the National Academy of Sciences to do more,
    The agency said it would "continue to evaluate and approve every aspect 10.______
of its work to keep the driving public safe, including research to assess potential
safety concerns and help ensure the reliability of electronic control systems".
选项
答案off——on
解析 本题为介词错误。根据句意：经过广泛的调查研究，那组科学家呼吁全国公路交通安全管理局增加技术援助。call off表示“取消、停止”，而call on表示“呼吁、要求”。
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