单项选择题
Accidents are of frequent（）on this motorway because the traffic is extremely heavy here.
A.arrivalB.proportionC.scaleD.occurrence
单项选择题 According to the weather（）, it's going to be fine today.
单项选择题 It took millions of years for order to grow out of the（）of the universe.
单项选择题 You should save your work often as a（）against computer failure.
