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【单选题】
食品污染物指：不是有意加入食品中，而是在生产、制造、加工、调制、处理、填充、包装、运输和贮藏等过程中带人食品中，或是由于环境污染带入食品中的任何物质。根据上述定义，下列属于食品污染物的是（ ）。A.
对肉质进行嫩化改良而使用的木瓜蛋白酶成分
B.
“三鹿奶粉”事件中“问题奶粉”含有的三聚氰胺成分
C.
油炸食品在加工过程中由于加人增多剂而产生的铝成分
D.
食品腌制时，使用的添加剂中含有的对人体有害的亚硝酸盐
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举一反三
【单选题】Why does author say that they were lucky in the third paragraph?
A.
Because her situation was not serious.
B.
Because many other places were flooded.
C.
Because she had been to Northern India.
D.
Because some others suffered even more.
【单选题】In Paragraph 4, why does the author give details about various legislative acts that were passed by Congress?
A.
To discuss the government's successful attempts to put an end to squatting.
B.
To describe how the U.S. government provided incentives for people to move west.
C.
To demonstrate that western territories were subject to the same laws as the rest of the country.
D.
To show that there were many barriers to becoming a landowner in the west.
【判断题】房地产权利包括物权和债权两大类，其中物权又包括自物权和他物权两类。自物权即所有权；他物权包括用益物权和担保物权，而用益物权又包括建设用地使用权和地役权等。
A.
正确
B.
错误
【单选题】在使用“快速约束”创建约束时,系统创建约束时的处理方式是( )。
A.
根据用户指定的快速约束优先级依次尝试
B.
按曲面接触、相合、偏移、角度、平行、垂直的固定顺序来创建
C.
按用户上次使用的约束命令来创建
D.
由系统智能判断
【判断题】房地产权利包括物权和债权两大类，其中物权又包括自物权和他物权两类。自物权即所有权；他物权包括用益物权和担保物权，而用益物权又包括土地使用权和地役权等。
A.
正确
B.
错误
【单选题】下列哪种关系是成反比的
A.
较短时间内，人体所受外照射辐射的累积剂量与接触放射源的时间
B.
对γ射线点源，某一点的吸收剂量与距源的距离的平方
C.
电离引起的能量损失与物质的原子序数
D.
轫致辐射引起的能量损失与物质的原子序数的平方
E.
以上均不对
【单选题】Why does the author mention the railroads in paragraph 1 ?
A.
Because miners were traveling to camps in the West
B.
Because mineral deposits were discovered when the railroads were built
C.
Because the western frontier was being settled by families
D.
Because traders used the railroads to transport their goods
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