In the past 10 year，______ measures have radically reduced level

In the past 10 year，______ measures have radically reduced levels of tooth decay in children.
A、primitive
B、preventive
C、predictable
D、premature
【正确答案】：B
【题目解析】：A. primitive的意思是“原始的、发展水平低的”；B. preventive的意思是“预防的”；C. predictable的意思是“可预见的”；D. premature的意思是“过早的、草率的”。因此选B. preventive，“预防的”。全句翻译：在过去的十年间，预防措施从根本上降低了儿童龋齿的人数。