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【单选题】
下列哪项不是原发性肝癌的病因A.
病毒性肝炎
B.
黄曲霉毒素
C.
肝硬化
D.
含亚硝胺类的食物
E.
免疫因素
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举一反三
【单选题】What’s the tough decision that many students have to make before an exam?
A.
How to cheat.
B.
Whether to cheat or not.
C.
What to do if they fail.
D.
What to do if they succeed.
【单选题】We suspected that he was the murderer even before we were told. A doubted B believed to be likely C believed to be unlikely
A.
doubted
B.
believed to be likely
C.
believed to be unlikely
【简答题】下列细胞分别属于哪种类型A. 肝细胞属于B. 呼吸道被膜细胞属于C. 骨骼肌细胞属于
【单选题】听力原文： The ancient Egyptians believed strongly in life after death. They believed that a person would need his body to exist in his afterlife. Therefore, they carefully preserved the body by treating i...
A.
kings of ancient Egypt
B.
the place where Egyptian kings were buried
C.
the preserved body of a dead person
D.
one of the Seven Wonders of the ancient world
【简答题】洪灾过后，饮用水的消毒杀菌成为抑制大规模传染性疾病爆发的有效方法之一。漂白粉是常用的消毒剂。根据所学知识，回答下列问题： ⑴工业上将氯气通入石灰乳制取漂白粉，反应的化学反应方程式为 ；漂白粉有效成分为（填名称） ；瓶装漂白粉久置空气中会呈稀粥状而失效，试用化学方程式表示失效的原因 。 （2）某化学兴趣小组为了探究HClO的漂白性，设计了如下的实验。 a.通入Cl 2 后，从集气瓶A、B的现象可得出...
【多选题】高铁酸钠（Na 2 FeO 4 ）是一种新型净水剂，可以对饮用水进行消毒和净化。工业上常通过如下方法制取：3NaNO 3 +Fe 2 O 3 +4NaOH=2Na 2 FeO 4 +3NaNO 2 +2H 2 O，下列有关说法正确的是 [ ]
A.
Fe 2 O 3 是氧化剂
B.
Na 2 FeO 4 既是氧化产物又是还原产物
C.
生成1mol Na 2 FeO 4 时，有3mol电子转移
D.
Na 2 FeO 4 能杀菌消毒是利用Na 2 FeO 4 中+6价铁的强氧化性被还原为Fe 3+ ，净水是利用Fe 3+
【单选题】听力原文： The ancient Egyptians believed strongly in life after death. They believed that a person would need his body to exist in his afterlife. Therefore, they carefully preserved the body by treating i...
A.
kings of ancient Egypt
B.
the place where Egyptian kings were buried
C.
the preserved body of a dead person
D.
one of the Seven Wonders of the ancient world
【单选题】What’s the tough decision that many students have to make before an exam?
A.
How to cheat.
B.
Whether to cheat or not.
C.
What to do if they fail.
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