要做50个直径是20厘米的铁圈,至少需要铁丝______米.

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问题:

要做50个直径是20厘米的铁圈,至少需要铁丝______米.

考点:圆的周长
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分解因式:

(1)x3-x;

(2)-2x+x2+1.

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导致龋齿的最主要食物因素是()

A.碳水化合物

B.脂肪

C.蛋白质

D.矿物质

E.维生素

题型:填空题

选用清洗剂时,首先应选用对()无损害的清洗剂。

A.人体健康

B.周围环境

C.机器零件

D.海洋环境

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明朝的《千金方》是当时世界上内容最丰富、考订最详细的药物学著作。

题型:填空题

Teachers need to be aware of the emotional, intellectual, and physical changes that younga-duhs experience. And they also need to give serious (91) to how they can best (92) such changes. Growing bodies need movement and (93) , but not just in ways that emphasize competition. (94) they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (95) that comes from achieving success and knowing that their accomplishments are (96) by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (97) to plan activities in which there are more winners than losers, (98) , publishing newsletters with many student-written book reviews, (99) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide (100) opportunities for leadership, as well as for practice in successful (101) dynamics. Making friends is extremely important to teenagers, and many shy students need the (102) of some kind of organization with a supportive adult (103) visible in the background.
In these activities, it is important to remember that young teens have (104) attention spans. A variety of activities should be organized (105) participants can remain active as long as they want and then go on to (106) else without feeling guilty and without letting the other participants (107) This does not mean that adults must accept irresponsibility. (108) , they can help students acquire a sense of commitment by (109) for roles that are within their (110) and their attention spans and by having clearly stated rules.

A.assistance

B.guidance

C.confidence

D.tolerance

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