2025届高考英语外刊阅读天天练 综合训练九
阅读理解
Cracking the code
【New Scientist (February 8, 2025)】
Sometimes there are hidden patterns in numbers you might not immediately notice.One example of this is in barcodes(条形码), the sequences of digits we use to identify products.
Try it yourself--find an object with a 13-digit barcode. Add together the first,third,and fifth digits and so on,to get the sum of the odd-numbered digits:then, add up the even digits. If you triple the even sum, and then add it to the original odd sum, the total should be a multiple of 10, ending in 0.
This isn't a coincidence: a barcode contains a checksum, ensuring that when it is scanned it has been read in correctly. Most of the digits are there to communicate information.The first two are a country code. The next 10 digits are more specific information about the product and who produced it. The purpose of the final digit is to detect errors or changes in the data, such as swapping two digits or entering one incorrectly.This would give a checksum that isn't a multiple of 10, allowing us to catch the error.
Barcode scanners use lasers to pick up the pattern of stripes, which encodes the same numbers.But these scanners are often cheap and can make errors, especially if the barcode is on a curved or shiny surface. So if you scan a barcode in a supermarket, it will read in the digits, compute the checksum and only beep if it is right---and until it gets a correct read, it won't accept it.
All kinds of systems have checksums:ISBNs on books, which use a similar system based on multiples of 11; UK driver's license numbers, which have two extra check digits at the end; and credit card numbers, meaning a website can tell you have entered it incorrectly before even checking with your bank. They all use variations of the same system, performing a simple calculation with the digits that confirms the number is valid.
It won't eliminate errors --for barcodes, there is still a 1 in 10 chance the checksum will come out as a multiple of 10 even if there is an error--but it greatly reduces them. It also doesn't tell you what the error is, so all you can do is try scanning the number again. But it saves time that would otherwise be wasted trying to process incorrect numbers, and it is an ingenious use of maths that makes the whole system more robust.
1. What is the main purpose of the checksum in a barcode
A. To identify the country of origin.
B. To ensure the barcode is scanned correctly.
C. To provide specific information about the product.
D. To encode the pattern of stripes.
2. According to the passage, what happens if a barcode is scanned incorrectly
A. The scanner will automatically correct the error.
B. The scanner will beep and accept the scan.
C. The scanner will not accept the scan until it is correct.
D. The scanner will display an error message.
3. Which of the following systems also use checksums
A. Passport numbers and social security numbers.
B. ISBNs, UK driver's license numbers, and credit card numbers.
C. Bank account numbers and phone numbers.
D. Airline ticket numbers and vehicle identification numbers.
4. What is the limitation of the checksum system mentioned in the passage
A. It cannot detect any errors in the barcode.
B. It has a 1 in 10 chance of failing to detect an error.
C. It only works for barcodes on flat surfaces.
D. It requires expensive scanners to function properly.
完形填空
“Give Me the Baby!”
【Reader’s Digest USA (October, 2024)】
Christine Dawn King was hurrying to her job as a caregiver to the elderly. The traffic was thick. She pulled into the exit lane, and that’s when she ___1__ a man and woman standing beside a stopped vehicle and ___2___ some kind of angry quarrel. The woman repeatedly attempted to ___3___ the man as he headed toward the guardrail, which ____4____ a 40-foot drop onto a concrete parking lot. Having reached the guardrail, the man dangled an ____5____ out. That’s a baby!
King hit the brakes, flung open her __6____ and ran at the man.“Give me the baby!”she cried. When King made a lunge for the child, the man looked her dead in the eyes.“I’ve got a gun,”he said,“and I will shoot you.”“OK,”King said, stepping backward and her body began to ____7____.
King looked over at the lines of ___8____. Many people were ___9___, even livestreaming on their phones. But no one got out of their vehicle. It was up to King, a mother of five, to stop this ___10___. She inched closer and pleaded,“Just give me the baby.”Again and again, King grasped for the girl but could not ___11___ her.
Then the sound of sirens. The cops swarmed in, weapons drawn. “They’re going to shoot you,”King warned the man. Still he ___12___. Now the officers were on him, grabbing and tugging at his arm. This was the moment when all would be resolved. In the ___13___, King worked her way through the scrum of bodies, plucked free the _____14___ toddler, leaving the police to subdue the man.
The child was unharmed. Many have wondered why King would __15___ her life for strangers.“I don’t have to know her,”she says, referring to the mother.“There was a baby involved.”
1. A. noticed B. ignored C. spotted D. missed
2. A. engaged in B. involved in C. participated in D. committed to
3. A. stop B. push C. block D. hit
4. A. faced B. overlooked C. viewed D. observed
5. A. object B. item C. thing D. figure
6. A. window B. trunk C. hood D. door
7. A. shake B. tremble C. freeze D. relax
8. A. cars B. vehicles C. trucks D. buses
9. A. filming B. watching C. recording D. streaming
10. A. disaster B. accident C. tragedy D. incident
11. A. catch B. free C. hold D. grab
12. A. hesitated B. paused C. refused D. resisted
13. A. confusion B. chaos C. mess D. disorder
14. A. scared B. terrified C. frightened D. shocked
15. A. endanger B. sacrifice C. lose D. risk
语法填空
Harbin Games hailed as great success
【China Daily (February 15, 2024)】
With Asia's growing ____1___(present) on the ice and snow celebrated and the host's organizational expertise ____2____(applaud) again, the 9th Asian Winter Games ended on Friday in Harbin, Heilongjiang province. Three years after the 2022 Beijing Winter Olympics reshaped the winter sports landscape in China, the successful hosting of the 9th Winter Asiad has built on the legacy ___3_____(expand) the thrills and chills into uncharted territories---- from Asia's hot and humid southeastern islands __4____ its dry and sizzling deserts in the west. The largest-scale Winter Asiad in history has seen nine countries and regions appear on the overall medal table, ____5____(make) the 2025 edition the most evenly contested Winter Asiad since the inaugural Games in 1986.
Preparing for the Games on ___6___ tighter-than-normal schedule, Harbin, which ____7____(confirm) host of the 2025 edition only 18 months in advance, pulled off almost a mission impossible to prepare five competition venues in the city's downtown, for ice sports, ___8____ eight courses at the Yabuli Ski Resort, 200 kilometers from the city center, for all the snow events, all of ___9_____ are up to the highest possible standards.
The warmth of the Chinese hosts and the breathtaking scenes in the "Ice City" of Harbin have also left visitors highly ___10____(impress).
BCBB
CACBA DABAC BCBBD
presence;applauded;to expand;to;making;a;was confirmed;and;which;impressed