单项选择题
A.frequency B.accuracy C.emergency D.efficiency
Her pulse was so weak that the doctor had difficulty（）i...
单项选择题Her pulse was so weak that the doctor had difficulty（）it.
A.inspecting B.detecting C.touching D.contacting
Accidents are of frequent（）on this motorway because the...
单项选择题Accidents are of frequent（）on this motorway because the traffic is extremely heavy here.
A.arrivalB.proportionC.scaleD.occurrence
According to the weather（）, it's going to be fine today...
单项选择题According to the weather（）, it's going to be fine today.
A.prediction B.indication C.provision D.forecast
