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【简答题】
已知下列数列都是等差数列,填出所缺的项,并求其公差. (1) 7,3, , , ,... d= ;
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A.
IBE
B.
balance of considerations reasoning
C.
neither of the above
【简答题】202+7150+1546
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【单选题】良好的用眼习惯包括（）
A.
连续近距离用眼时间不能过长，应控制在40-50分钟
B.
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C.
认真做眼保健操
D.
以上均是
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