世界组织把铝确定为食品污染源之一,应加以控制使用。铝在下列应用时应加以控制的是

题型:选择题

问题:

世界组织把铝确定为食品污染源之一,应加以控制使用。铝在下列应用时应加以控制的是 [ ]

①制铝合金 ②制电线 ③制炊具 ④明矾净水 ⑤明矾与苏打制食品膨松剂

⑥用氢氧化铝凝胶制胃舒平药片 ⑦银色漆颜料 ⑧易拉罐 ⑨包装糖果和小食品 

A.③⑤⑧⑨

B.①②⑥⑧⑨

C.③⑤⑨

D.③④⑤⑥⑧⑨

考点:生活中的元素(常量元素、微量元素)
题型:选择题

如图所示,太阳光与地面成40°射来,要使光线沿竖直方向反射入井中,求作:

(1)平面镜的位置;

(2)计算出平面镜与水平方向夹角大小并在图上标出.

题型:选择题

One spring,when 1 was 1 0,during one of my father’s layoffs,I could tell my mother was unhappy.I decided to cheer her up by buying her a special Mother’s Day gift.

One day after school I rode my bike to the Agins,which,I learned years later,was known for its high-end fashions and style.I introduced myself to Sylvia Agins,telling her I was looking for a Mother’s Day present.

“Do you think she’d like a purse ?”she asked.“I think she might.”I told her.

She took out an Italian purse made of leather.She asked me what I thought,and I told her that my mom would like it.

“How much money do you have?’’she asked.

“Twelve dollars,”I said.

“You’re in luck,”she told me.“It’s only $11.You have a dollar left over for the card.” She wrapped the purse and thanked me for my business,and I rode off home with the package under my arm.

When my mother opened the gift the next Sunday morning,she asked in an accusing tone,“Where did you get this?”

“I bought it at the Agins.It cost me$1 1.’’I said.

My mother was shocked into silence.

It wasn’t until many years 1ater,when I learned that the purse was worth several hundred dollars,that I appreciated just how wonderful Sylvia Agins had been to me.I always felt regretful  that I never had a chance to properly thank her.

‘‘You know,my son,what really amazes me to this day,”my mother said.‘‘Letting you have the purse for just a few dollars was unbelievable enough.But the fact that she let you leave the store with a dollar for the card was a touch of kindness that 9 11 never forget.”

小题1:Why did the author buy his mother a purse?

A.To thank his mother for buying him a bike.

B.To show his ability of making money.

C.To make his mother happy.

D.To surprise his mother.小题2:The author’s mother was shocked into silence because______

A.the Agins charged so little money for the purse

B.the author bought a card to go with the purse

C.she wasn’t expecting a gift from her son

D.the purse was bought from the Agins小题3:Sylvia Agins’behavior shows that_______

A.she is critical and mean

B.she is kind and thoughtful

C.she is good at making money

D.she knows how to choose presents小题4:Which can be the best title for the text?

A.A Clever Shop Owner

B.A Considerate Mother

C.An Unforgettable Event

D.A Priceless Mother’s Day Gift

题型:选择题

有五种黑色粉末:铁粉、炭粉、氧化铜、硫化亚铁、二氧化锰,用一种试剂即能将它们鉴别开,这种试剂是_______________。

题型:选择题

诽谤罪与侮辱罪的主要区别有()

A.犯罪主体不同

B.是否可以采用暴力方法不同

C.是否捏造虚假事实不同

D.犯罪客体不同

E.是否有“情节严重”的要求不同

题型:选择题

心律失常常见症状表现为()

A.胸闷

B.心悸

C.恶心、呕吐

D.腹痛

E.头晕、黑矇

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