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【单选题】
生态元素是村境生态的重要组成部分，以下哪个元素的缺失会导致孕妇的早产、儿童智力落后、痉挛性瘫痪、斜视、粘液性水肿、神经运动障碍、胎儿甲状腺功能减退?(）A.
缺锌
B.
缺硒
C.
缺镁
D.
缺碘
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A.
Because Tom is praised a lot by senior managers.
B.
Because Tom will be most appreciated by his team members.
C.
Because Tom is assigned to be the leader of a team.
D.
Because Nancy is the person who Tom is accounta ble for.
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【简答题】根据不定积分的定义,求不定积分: =
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