单项选择题
In the advanced course students must take performance tests at monthly（）
A.gaps B.lengths C.distances D.intervals
单项选择题 Four people were seriously（）in an accident on the motorway.
单项选择题 Thousands of people died of starvation during the（）in that African country.
单项选择题 We finally managed to（）the committee's approval of our plans.
