自命卷3(学生用)VIP

1 1 The falling of apple from a tree helped Newton to discover law of gravity A an theB an aC the theD the a 2 Marilyn s dream of being a film star became a which delighted her parents very much A signal B reality C glory D goal 3 When changing lanes 车道 a driver should use his turning signal to let other drivers know A he is entering which lane B which lane he is entering C is he entering which lane D which lane is he entering 4 You and I could hardly work together because of differences in character A could we B couldn t I C couldn t we D could you 5 The teacher won t explain makes his students so fascinated with his lessons A what it is thatB that what it isC what is it thatD that what is it 6 I am often told not to take things that A are not belonging to me B are not belonged to me C don t belong to me D don t belong to mine 7 As she was too young she was not the concert hall A asked for B admitted into C taken along D brought with 8 When crossing the busy road one must be very careful otherwise there would be possibility of A running across 偶遇 B running out C being run over 撞到 D being run out 9 We should respect food and think about the people who don t have we have and treat food nicely A that B which C what D whether 10 I do everything for my son but he still fails me I m sorry to say that s you are mistaken A how B why C what D where 11 Nowadays many boys and girls grow the pop stars and their models A crazy about learn B crazy about follow C crazy for take D crazy for follow 12 You return the novel to the library by tomorrow or you will be fined A shallB canC willD may 13 He chose Italy but I d prefer to go to Spain A personally B logically C swiftly D regularly A Bar codes are one way that the U S Postal Service streamlines mail of the wrong hands A letter that comes without a bar code or cancelled stamp might not have been processed by the U S Postal Service and it might indicate that something s fishy 可疑 Can you decode a bar code the way the U S Postal Service can Here s How 2 1 Here s how to read the bar code on your letter Most U S letter bar codes have bars of two lengths long and short Every bar code should start and end with long bars ignore those Look at the rest of the bars in groups of five starting with the second bar Each group of five represents a digit 数字 2 Here s how to figure out what those digits are The five bars stand for one of these numbers 7 4 2 1 0 Some genius figured out that this range would allow you to come up with the digits 0 to 9 You do it by adding the numbers of the long bars together Say you have this bar code Here the 4 and 2 places have long bars Added together they total 6 so this bar code stands for 6 Say you have this bar code The 1 and 0 places have long bars Added together they total 1 so this bar code stands for 1 Say you have this bar code The 7 and 4 pieces have long bars Added together they total 11 but there is no 11 in this system so this bar code stands for 0 3 Now let s look at the bar code on a letter Ignore the first and last bars of the whole bar code Then look at the next 20 bars to find the zip code 0680 The next two sets of five bars give your mail carrier s number 10153 The rest of the bars in the bar code indicate the house or maibox number The house number is 32 63 Why does US Postal Service just use five numbers for the five bars A They are easy to read B They are ohosen only by accident C They can stand for the long bars D They are enough to make ten digits 64 Which of the following bar codes otands for 7 according to the text 65 According to the text we know that A the bar code often beings with a short bar B the last short her is often ignored C the mail route should follow the zip code D the bar code can show your house color 66 The purpose of the text is to let us know how to A create a bar codeB recognize a bar code 3 C send a letterD make the maibox safe B Ever wonder how much a cloud weighs What about a hurricane A meteorologist has done some estimates and the results might surprise you Let s start with a very simple white puffy cloud a cumulus cloud 积云 How much does the water in a cumulus cloud weigh Peggy LeMone senior scientist at the National Center for Atmospheric Research in Boulder Colorado did the numbers The water in the little cloud weighs about 550 tons she calculates Or if you want to convert it to something that might be a little more meaningful think of elephants The thought of a hundred elephants worth of water suspended in the sky begs another question what keeps it up there First of all the water isn t in elephant sized particles 微粒 it s in tiny tiny tiny particles explains LeMone And those particles float on the warmer air that s rising below But still the concept of so much water floating in the sky was surprising even to a meteorologist like LeMone I had no idea how much a cloud would weigh actually when I started the calculations she says So how many elephant units of water are inside a big storm cloud 10 times bigger all the way around than the puffy cumulus cloud Again LeMone did the numbers About 200 000 elephants Now ratchet up the calculations for a hurricane about the size of Missouri and the figures get really massive What we re doing is weighing the water in one cubic meter theoretically pulled from a cloud and then multiplying by the number of meters in a whole hurricane she explains The result Forty million elephants That means the water in one hurricane weighs more than all the elephants on the planet Perhaps even more than all the elephants that have ever lived on the planet 67 The weight of is NOT mentioned in the passage A a cumulus cloudB a tornadoC a hurricaneD a storm cloud 68 Ho