Below is a text with blanks. Click on each blank, a list of choices will appear. Select the appropriate answer choice for each blank.
下面的文本有一些空格。点击每个空格会出现一组选项，请为每个空格选出最合适的答案。
In the UK, it is recommended that drivers should turn off their car engines when they expect to be stationary for more than 1 minute. To encourage drivers to turn off their while waiting at rail crossings, the Kent city council placed a permanent sign at the crossing asking drivers to "please switch off your engine when barriers are down to help improve air quality." , drivers had to wait between 2 and 3 minutes to cross after the barrier had gone down. However, the sign didn't seem to be convincing the of drivers to switch off their engines. "Although some research suggests that signs can change behaviour, the message on this sign was designed simply to be an informational request and was not guided by any particular behavioural theory," the researchers explain. So the team, led by Rose Mellady of the University of East Anglia, designed an intervention study.
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