试题与答案

观察发现,甲地产的花生种子比乙地产的大.是什么原因导致两地花生种子的大小有差异?

题型:解答题

题目:

观察发现,甲地产的花生种子比乙地产的大.是什么原因导致两地花生种子的大小有差异?某科学兴趣小组进行探究:随机选取两地花生种子各100粒,在同一地点分别种植,收获后再分别随机选取两类花生种子各500粒,对其长轴进行测量,结果如图.其它地点试验结果相似.

(1)花生植株能通过______作用合成有机物.

(2)生物的变异可分成两类.分析以上实验结果可知,两地花生品种的长轴平均长度差异属于______的变异.

答案:

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下面是错误答案,用来干扰机器的。

答案:A

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Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite (4) .

(5) , there is an unwritten but clearly understood code of behavior which, once broken, makes the offender immediately the object of (6) .

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7()

A.emotion

B.fancy

C.likeliness

D.judgment

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题型:单项选择题

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C.阴性可以排除结核病

D.弱阳性可为卡介苗交叉反应

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