The author' s attitude towards the government decision may he described as __________.

【定位】最后一段。
【答案详解】本题为作者态度题。由最后一段可以看出，作者对政府这项规定持肯定态度，四个选项中A、C和D均是消极态度。故选B。
【高频词汇】
1．radioactive放射性的 2．digestive消化的 3．unjustified不公正的
【难句解析】
Scientists now know that exposure to large amounts of radiation can cause cancer，a group of diseases in which bodily cells grow wildly out of control．
在that引导的宾语从句中，主语是exposure，介词短语to large amounts of radiation作主语的后置定语。diseases既是cancer的同位语，又充当先行词，后接的定语从句是由介词加关系代词引导。out of control表示“失去控制，失去节制”的意思。