【名词&注释】
减数分裂(meiosis)、离子交换法(ion exchange method)、粗线期(pachytene)
[单选题]下列有关硬水及其软化的说法中错误的是：
A. 离子交换法可以软化硬水
B. 硬水中含有较多Ca2+、Mg2+
C. 生产、生活使用的天然水必须经软化
D. 加热可使暂时硬水中的Ca2+生成CaCO3沉淀
查看答案&解析
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举一反三：
[单选题]黄藻门与金藻门的贮藏物质均为金藻昆布糖和油。( )
A. 正确
B. 错误
[单选题]减数分裂中，四联体形成于前期工的( )。
A. 细线期
B. 偶线期
C. 粗线期
D. 双线期
E. 终变期
[单选题]What can we learn from the last two paragraphs?
A. More time should be spent on computers.
B. Children should be forbidden from watching TV.
C. 'IV sets shouldn't be allowed in children's bedrooms,
D. Further studies on high-achieving students should be done
[单选题]Over the past 20 years, the Internet has helped change our world in way or another for the better.
A. any
B. one
C. every
D. either
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