题目

1820年丹麦物理学家奥斯特发现了电流的磁效应．在奥斯特实验中，将直导线沿南北方向水平放置，指针靠近直导线，下列结论正确的是（ ） A . 把小磁针放在导线的延长线上，通电后，小磁针会转动 B . 把小磁针平行地放在导线的下方，在导线与小磁针之间放置一块铝板，通电后，小磁针不会转动 C . 把小磁针平行地放在导线的下方，给导线通以恒定电流，然后逐渐增大导线与小磁针之间的距离，小磁针转动的角度（与通电前相比）会逐渐减小 D . Birthday Traditions in Different CountriesEnglandCertain symbolic objects are mixed into the birthday cake as it’s being prepared．If your piece of cake has a coin in it，then you will be rich．Also，when it’s your birthday，your friends give you the“bumps”．They lift you in the air by your hands and feet and raise you up and down to the floor；one for each year you lived，then another one or two for luck．DenmarkA flag is flown outside a window to show that someone who lives in that house is having a birthday．Presents are placed around the child’s bed while he/she is sleeping，so he/she will see them at once upon awakening．HollandSpecial year birthdays such as 5，10，15，20，21 are called“crown”years．The birthday child receives an especially large gift on a crown year birthday．The family also decorates the birthday child’s chair at the dining room table with flowers，paper streamers and balloons．CanadaThe birthday child’s nose is greased（涂抹）with butter for good luck．The greased nose makes the child too slippery for bad luck to catch him/her．In some parts of Canada，the birthday person even receives a punch（一拳）for each year he/she is alive and then one for good luck．BrazilThe birthday child receives a pull on the ear for each year he/she has been alive．The birthday person also gives the first plece of cake to his/her most special friend or relative，usually mom or dad．KoreaThere is a big family party on the first birthday．The table is set with food，and four items：a pencil，a ruler，thread，and money．The item that the baby chooses is said to forecast his/her future：excellent student，good with hands，long life or riches．South AfricaOn the twenty-first birthday，a key made of anything from paper to silver to gold is presented by the parents as a sign that the child is ready to unlock the door to their future．1.If a British friend is raised up and down to the floor 21 times on his birthday，he is most likely（可能的）to be ．A. 23 B. 22 C. 21 D. 202.The following tradition is mentioned in the passage EXCEPT for ．A. receiving a pull on the face B. having a big family partyC. greasing butter on the nose D. placing presents around the child’s bed3.In which countries do people celebrate their 21st birthday specially？A. Canada and England． B. Holland and South Africa．C. Brazil and Holland． D. Denmark and Korea．4.The passage mainly tells us ．A. people in different countries have their own special year birthdaysB. people always have a big birthday party at home in different countries C. people in different countries celebrate their birthday in different waysD. people always know a 1-year-old baby’s future from the item he chooses