问题 选择题

有些元素在食品中的含量稍高会引起毒性反应.我国食品卫生法对这些元素在食品中的含量的最高标准有极严格的规定,这些元素是:①Na ②Mg ③As(砷) ④Cd(镉) ⑤Ca ⑥Zn ⑦Hg ⑧Pb(铅)⑨Cu ⑩K(  )

A.⑥⑦⑧⑨

B.②④⑥⑧

C.③④⑦⑧

D.②④⑥⑦⑧

答案

③As(砷)、④Cd(镉)、⑦Hg、⑧Pb(铅)四种金属属于重金属,进入人体后与人体内蛋白质结合,能使蛋白质变性,失去生理活性,所以它们都是有毒的.

故选C.

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Holiday Activities

     Katong Community Centre provides enrichment activities at reasonable rates.This December holiday,

Katong CC has packed a complete and dynamic series of holiday activities for kids.From discovery

science,street magic to speech & drama camps,we have it all!

      Bring out the natural creativity in your child.We have Baking Workshop (5 years & up) on 2

December 09 and Flower and Card Making (5 years & up) on 17 December 09.

Get professional advice from a certified image consultant @ Kids' Dining Etiquette course (6~14 years)

on 3 December 09.Now you can bring your kids to your wedding anniversary dinner without worrying

about them making a scene.

     Fun in Mandarin on 2 December 09 (3~6 years) caters specificaly to preschool kids.

     Discover that little magician of yours with our IKIDSStreet Magician:Building Confidence course on

11 December 09 (7~12 years) Future Doctorstobe with our Lollipops Life Science:The Little Doctor

course on 9 December 09 (5~10 years) and The Little Cell Biologist course on 13 December 09

(5~10 years)

Due to overwhelming demand,we have arranged 3 extremely popular kids'camps (6~12 years) this

December holiday!Fairytale Holiday Chinese Camp 28~30 November 09,Magic  Moments  English

Speech & Drama Camp 2~6 December  09  and  Magic Moments Mandarin Speech Drama Camp

9~12 December 09.

     Materials for all activities will be provided.

     Register before 27 October 09 to get a free gift!

     Bring your kids down to Katong CC and experience learning the fun way!

1. Which one of the following activities requires the longest time to complete?

A. Fun in Mandarin.

B. Fairytale Holiday Chinese Camp.

C. Magic Moments English Speech and Drama Camp.

D. Magic Moments Mandarin Speech and Drama Camp.

2. After attending the Building Confidence course,the children will________.

A. become magicians

B. overcome stage fright

C. grow cells in the body

D. tend to patients in the hospital

3. If you want your son to learn some table manners,which of the following activities can you register

him in?

A. Baking Workshop.

B. Lollipops Life Science.

C. Flower and Card Making.

D. Kids'Dining Etiquette course.

4. Which of the following statements is true?

A. Participants need not bring any materials for the activities.

B. All activities are targeted at primary school children only.

C. All participants will receive a free gift upon registration.

D. All activities are organised throughout the year.

5. A couple with three children aged 6,9 and 14 want them to attend the same activities together.The

number of activities they can attend is________.

A. one  

B. two  

C. three  

D. four

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