题目

 The national parks are very important for the protection of these wild animals, which would ______ run the risk of becoming extinct. A. therefore               B. instead                       C. otherwise               D. anyhow 答案：C命题p:实数x、y满足命题q:实数x、y满足则p是q的______条件.(    )A.充分不必要        B.必要不充分       C.充要               D.既不充分又不必要