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目前，铅污染已成为威胁我国公民健康的“隐形杀手”，污染源主要是汽车尾气、家装饰品等．为探究铅对人体健康有无影响，科研人员选取30只大小和健康状况相近的小白鼠，并平均分为3组进行实验，实验处理如下表．30天后，获得的实验数据如右图所示．（注：醋酸铅是一种含铅化合物） 注射剂 剂 量 注射方法 检测方法 甲 ？ kg体重 注射10mg 每3天皮下注射一次 每10天检测1次血红蛋白含量 乙 含1.8%醋酸铅的5%葡萄糖溶液 丙 含3.6%醋酸铅的5%葡萄糖溶液 请你回答． （1）若甲和一组对照实验，其变量为注射剂中是否含有醋酸铅，那么，甲组应注射______溶液．你对该实验作出的假设是：______对小白鼠的健康有影响． （2）若此假设与实验结果不符时，你认为正确的做法是______． A．放弃该实验 B．如实记录，重新再做实验 C．马上否定原来的假设 D．修改实验数据，使结论与假设一致 （3）根据右图，得出该实验的结论是： ①由甲和乙曲线可知，铅______（能，不能）影响小白鼠体内血红蛋白含量； ②由丙曲线可知，小白鼠体内铅的含量越高，其体内血红蛋白含量______．
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【简答题】0502P149 ★★盘点的主要内容?
【单选题】Energy will be one of the defining issues of this century. One thing is clear: the era of easy oil is over. What we all do next will (1)_____ how well we meet the energy needs of the entire world in t...
A.
decline
B.
determine
C.
declaim
D.
decide
【单选题】_____ is one of the defining characteristics of a culture.
A.
Language
B.
Wealth
C.
Business
D.
Networking
【单选题】Decide whether the following sentence contain a Defining or Non- defining relative clause. Catherine, who has tried many times to give up coffee, is now down to one cup a day.
A.
Defining relative clause
B.
Non- defining relative clause
【单选题】Energy will be one of the defining issues of this century. One thing is clear: the era of (1)_____ oil is over. What we all do next will determine how well we meet the energy needs of the entire world...
A.
fossil
B.
eternal
C.
easy
D.
formidable
【单选题】Decide whether the following sentence contain a Defining or Non- defining relative clause. He is the one that I would choose.
A.
Defining relative clause
B.
Non- defining relative clause
【单选题】Energy will be one of the defining issues of this century. One thing is clear: the era of (1)_____ Oil is over. What we all do next will determine how well we meet the energy needs of the entire world...
A.
fossil
B.
eternal
C.
easy
D.
formidable
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