下述多发性硬化的临床表现中正确的是（） A.先有疲劳、体重减轻

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问题单项选择题 A1/A2型题

下述多发性硬化的临床表现中正确的是（）

A.先有疲劳、体重减轻、肌肉关节隐痛、感冒、感染、外伤、药物过敏等表现。首发症状多为一侧或多个肢体无力麻木；单眼或双眼视力减退、失明、复视，痉挛性或共济失调性下肢瘫，Lhermitte征

B.先有发热、肌痛等，继之以偏盲、偏瘫、失语、脑膜刺激征、意识障碍

C.发热、畏光、头痛、肌痛、恶心、呕吐、全身无力、颈项强直、Kernig征

D.意识模糊、共济失调、局灶性脑损害，病变轻、预后好，多有带状疱疹史

E.病前有发热，首发症状为双下肢麻木无力，病变部位根痛或病变节段束带感，继而完全横贯性损害

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参考答案：A

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已知平面上定点F₁、F₂及动点M．命题甲：“||MF₁|-|MF₂||=2a（a为常数）”；命题乙：“M点轨迹是F₁、F₂为焦点的双曲线”．则甲是乙的______条件．

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     London is one of the most popular sites in the world for tourists to visit. If you are planning a trip to
London in the future, you're lucky. There are a variety of attractions for you to enjoy.
     One of the most popular tourist attractions in London is the Tower of London. Founded more than 900
years ago, the Tower of London is one of the world's most famous towers and has changer a lot. Here,
you can also find the seven raven(乌鸦)which live in the Tower. There is a story that says:If there are no
ravens in the Tower, the Tower and the kingdom will fall. There are also lots of tours, exhibits and special
events that you can enjoy throughout the year.
    Another popular place to visit is Westminster Abbey. It was set up in 1065 by Edward the Confessor.
Visitors to Westminster Abbey can enjoy its beautiful special Gothic architecture(哥特式建筑). There are
also lots of memorials of Kings and Queens to enjoy. Excellent transportation is available here by bus or
tube from many locations in London.
      Buckingham Palace is another place with a rich history to discover. It's the official London residence(住处) of Queen Elizabeth II. During August and September, you can visit the State Rooms and see the
Changing of the Guards. The Queen's Gallery is opened to the public daily. Checking the official timetable
before you make sure to visit the Palace is a must, because it is not open year round.
       If you're expecting to enjoy one of London's most beautiful landscapes, Hyde Park is the place for
you. There are many activities available here to enjoy, including guided walking tours, swimming, tennis,
and horse riding. In addition, many concerts are performed in Hyde Park. There's also a playground
available for the kids.
                                                          Tourist attractions in London

The Tower of London	Built (1) __________900 years ago, the Tower of London is world-famous. There are many ravens living in the Tower. (2) __________to an old story, if there are no ravens in the Tower of London, the Tower and the kingdom will fall. * During the (3) __________year, you can enjoy lots of tours, exhibits and special events.
Westminster Abbey	(4) __________in 1065, Westminster Abbey is famous for its beautiful special Gothic architecture and memorials of Kings and Queens.
Buckingham Palace	* With a rich (5) __________to discover, Buckingham Palace is the official London residence of Queen Elizabeth II. (6 ) __________August to September, you can visit the State Rooms and see the Changing of the Guards. The public can get (7 ) __________to the Queen's Gallery every day. It's (8 ) __________to check the official timetable before you visit the Palace.
Hyde Park	As one of London's most beautiful landscapes, Hyde Park is the palace for you to walk, play tennis, (9) __________and ride horses. In addition, you can go to a (10) _____ that is performed in Hyde Park.

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