下列4种生物中，细胞结构与其它3种生物有明显区别的是（  ）

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Summer Holiday Fun 2015!

    The summer holidays are upon us again. Here is our guide to summer holiday fun in Peterborough!

Peterborough Museum

    The Age of the Dinosaurs is the museum's main attraction this summer. Get up close to prehistoric creatures via some great hands-on exhibits！Watch out for monsters lurking around every ember！The museum is open from 10:00 am to 5:00 pm Monday to Saturday，and from 12:00 pm to 4:00 pm on Sundays in August.

Call 01733 864663 for details.

    School holiday fun：Young people aged 13—19 will be able to produce their own music，compete in sports activities，or try their hand at cooking at Saxon Youth Club，Saxon Community Centre，Norman Road，Peterborough every Monday and Wednesday from 3:00 pm. PLUS an aero ball tournament will take place on Thursday,12th August between 3:30 pm and 6:30 pm.

Call 01353 720274 for details.

Houghton Mill

    Through the Looking Glass—a new production of the family favorite on Monday 30th，August. Bring rugs or chairs to sit on and a picnic if you wish to eat during the play. Gates open 5:30 pm，performance 6:30 pm—8:30 pm. Tea room will be open until the end of the interval. Adult ￡ 10. Child ￡7. Family ￡20.

Booking advisable on 0845 4505157.

Farmland Museum and Denny Abbey

    Farmland Games：From Wellie Wanging to Pretend Ploughing matches，come and join the Farmland Team. Collect your sporting stickers and create a colorful rosette that is fit for a winner！No need to book，just turn up between 12:00 pm and 4:00 pm on Thursday,19th August. Suitable for children aged four and above，each child should be accompanied by an adult and all activities are included in the normal admission price. Tickets Cost：￡ 7 per child.

For further information，call 01223 810080.

阅读短文，下列问题

    People in many countries are learning English.Some of them are small children. Others are teenagers. Many are adults. Some learn at school, others learn by themselves. A few people learn English by hearing the language over the radio, on TV or in films. As we know, it's hard to learn a foreign language well. One must work hard to learn another language. Because we can't use it often. But if you have right ways to learn English, it's a piece of cake.

    Why do all these people want to learn English?It is difficult to answer this question. Many boys and girls learn English at school because it is one of their subjects required (要求) for study. They study their own language, math and English. Some people learn it because it is useful for their work. Many people learn English for their higher studies,because at colleges or universities some of their books are in English. Some people learn English because they want to read newspapers or magazines in English.

根据短文内容选择正确答案。

图示为某海区洋流示意图。读图，回答下列问题。

下列关于南极地区气候的描述错误的是（　　）