Come prepared: When you arrive at a race, your bike should be in race-ready condition.

Chain Management: Chain damage is still the number one problem with mountain bikes. Keeping your chain clean and well-oiled will help, as will frequent chain replacement. Periodic inspection of your chain for wear, stretch and damage may save you a long walk home.

Packing Tape: This can be used for rims trips, boots for fractured tires and a dozen more makeshift repairs. If you've flown to the race, it also saves you from having to borrow tape to close up your bike box for the flight home. Other musts: safety pins and plastic zip ties.

Pre-race: Visual inspections before any serious off-road ride, carefully examine the area where the tire hooks onto the rim and remove any foreign objects which could cause premature（比预期早的）tire wear.

Tire Pressure: Check tire pressure before race start. The recommended pressure is noted on the tire sidewall, usually 40 lbs., many racers run 50 lbs., or more for less rolling resistance.

Be Self-Contained: Make sure you are self-contained. Bring your own drinking water, food and first aid kit. Also have tools, spare parts, tubes, quick fills and a chain tool. Never suppose you can just borrow these items from a friend.

Post-race Visual Inspections: Inspect your bike after completing each event, especially before competing in a downhill event. Re-inspect before packing your bike for the trip home.

Have Fun!

73. This passage is written for those who _______.

    A. go in for outdoor activities                                  B. love cycling in other places

    C. will join in mountain bike races                          D. are preparing for a marathon

74. The writer seems to advise the racers ________.

    A. not to replace chain frequently                          B. not to take an extra chain

    C. to bring less while racing                                   D. to have higher tire pressure

75 The passage is organized in order of _______.

    A. importance                  B. time                              C. readers' interest        D. place

76. From the passage we can safely say that _______.

    A. a foreign tire is a guarantee for the cyclist to win the race

    B. the biggest trouble for the race is that nobody will help you

    C. a downhill event causes more damage to the bike than an uphill one

    D. regular inspection is a must before, during, and even after the race

All penguins (企鹅) swim in cold waters and so need a good layer of insulation (隔离), some species come ashore in hot places.Humboldt penguins,for example,nest in arid hot - 40°C, deserts on the west coast of South America, while others survive the lowest temperatures of any animals.Male Emperor penguins,as we know, spend the Antarctic winters incubating eggs in temperatures that can fall below -70°C. The insulation is provided in layers, under the skin is a thick layer of fat, then there is a layer of downy feathers that trap air, and finally another layer of waterproof feathers that keep the cold water away from the skin. With all this insulation penguins have no problem keeping warm at temperatures down to about -10°C - although they have special adaptations of the circulatory system to keep their feet from freezing and to prevent much heat loss through the feet that are on the ice. At lower temperatures penguins have to huddle (蜷缩) together to keep warm. In such huddles the penguins gradually move from the hot interior to the cold outside so that every penguin has his turn in the middle and on the outside.

In hot climates, penguins suffer greatly from overheating. They use several strategies to lose heat. They puff up their feathers so that air can circulate to their skin; they hold their flippers（脚蹼）out from their bodies and pump hot blood to them so that they can act as radiators; they open their mouths and breathe to lose heat from their hot breath; and those species that live in hot climates also have several bare patches of skin around the eyes and feet, they send blood to these bare patches when they are hot - you can recognize a hot penguin since it will have pink eye patches and pink patches on its feet.

77. Which of the following are the ways for penguins to keep warm?

a. staying together in good social order 

b. several layers as radiators

c. a special circulatory system                    d. waterproof feathers

e. sending blood to bare patches

f. always staying in the middle

A. a, b, c                            B. a, c, d                           C. b, c, e                            D. c, d, f

78. The insulation consists of _______ layers.                                                      

    A. two                                B. three                            C. four                                D. five

79. The underlined "puff up" in the second paragraph can be replaced by ______.

    A. breathe deeply           B. blow up                        C. hold tight                     D. spread out

80. The passage mainly tells us ______.

    A. how penguins stay warm in cold places          B. that penguins are a clever animal

    C. how penguins keep their temperature            D. why penguins can live a safe life

第四部分：书面表达（满分25分）

请根据下列图表及文字说明用英语写一篇短文,内容应包括中美高中生零花钱的主要来源、比例、差异及原因。

Pocket Money Sources for High School Students

要求：1.词数100个左右。短文题目已为你写好并不计入总词数。

2.不可逐字翻译,但可适当增加内容,使行文连贯。

    3.参考词汇:百分比  percentage (n.)

－These oranges are only a dollar eighty-nine a pound. (东城区)

        －Well, they are_______than the others, but they don' t look_______good.

        A. prettier; very             B. cheaper；as           C. better；too             D. more expensive;so

The photos on the wall_______Grandma of those happy,old days when a large family lived 

   together.(西城区)

       A.repeat         B.remember           C.remind    D.retell

－What's the trouble this time?(西城区)

  －Well,doctor,I just can't_______this terrible dream every night.

        A.get out of  B.get away with    C.get down to        D.get through

The book ______ for adults is not suitable for teenagers to read.(西城区)

       A.provided     B.intended     C.providing     D.intending

Doing science exercises often_______most of the students'spare time.(西城区)

       A.takes off     B.takes up     C.goes off        D.goes up

The two families have_______their disagreements out of court in a friendly way,and this is

        what all of us expected to see.(西城区)

        A.settled        B.solved         C.defeated      D.overcame

－Tom failed his exam again.(丰台区)

        －But what did you_______? He had never been working hard.

         A.think     B.expect  C.consider        D.imagine