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南通濒临海，有较长的海岸线，海洋资源十分丰富。 （1）海水晒盐可获得粗盐，在实验室中粗盐经过溶解、_________、_________可制得精盐。 （2）目前世界上60%的镁是从海水中提取的。其主要步骤如下 ①提取Mg的过程中，试剂A可以选用_________，试剂B选用_________，由无水MgCl 2 制取Mg的反应类型为______________。 ②分离出Mg(OH) 2 后的NaCl溶液中还含有CaCl 2 、Na 2 SO 4 等杂质，为了获得NaCl溶液，在分离后的溶液中依次加入过量的BaCl 2 溶液、Na 2 CO 3 溶液，过滤，再向滤液中加入适量盐酸。实验中加入过量BaCl 2 溶液是为了除去_________；加入过量Na 2 CO 3 溶液的目的是__________________。 （3）目前海水淡化普遍采用“多级闪急蒸馏法”，证明蒸馏得到的淡水的方法是_________。
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【简答题】Write brief notes on types of Genetic disorders:
【单选题】Although genetic mutations in bacteria and viruses can lead to epidemics, some epidemics are caused by bacteria and viruses that have undergone no significant genetic change. In analyzing the latter, ...
A.
An outbreak of Lyme disease
B.
An outbreak of dengue hemorrhagic fever
C.
An epidemic of typhoid
D.
An epidemic of paralytic polio among infants
E.
An epidemic of paralytic polio among adolescents and adults
【单选题】The last paragraph suggests that______.
A.
genetic discrimination only concerns those who are predisposed to terrible disease
B.
the appeal of plaintiffs subjected to genetic discrimination will terminate favorably without exception
C.
judges and juries always bias in favor of people with whom they share similar experience
D.
it is believed from the genetics perspective that no one carries perfect gene
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