Bar Code
All the packets you buy in a supermarket carry a bar code.This code is scanned (扫描) by laser light and the brand and product names are given to the customer with the price.The people running the store can keep a continuous check of how many packets of each product and of size are on the shelves.Special supermarket checkouts are needed to read the code.
The code is a mixture of bar and space width.It is printed onto the package and cannot be written by hand.
A bar code showing the Australian Product Number (APN) symbol, made up of vertical (直的) stripes and spaces.
The Australian Product Number, which you see in supermarkets, is made up of 13 digits (numbers).For example: 9300663271733 means:
93 = country code.Australia is 93, New Zealand is 94.
00663 = manufacture's code--all products from this maker have this code number.
27173 = product number and size tells what the product is, and the size of the article.
3 = check digit--from the addition of some previous digits.This check's to make sure that the code has been read correctly.
1.Bar Codes are made up of ________.
A.13 equally spaced bars
B.13 numbers matching 13 even bas
C.a mixture of bars and space widths
D.a mixture of equal spaced, varying width bars
2.It is NOT possible to ________.
A.have Bar Codes for all supermarket packets
B.make Bar Codes, using more than one zero
C.buy goods using foreign Bar Codes
D.draw your own Bar Codes
3.The following Bar Code informs the supermarket manager that the ________.
9312345678907
A.product has no APN symbol
B.goods came from New Zealand
C.product was produced in Australia
D.particular goods are almost out of date.
CDC
A. Profits enlarging B. Technology developing C. Education investing D. Benefits transferring E. Dominance disappearing F. A nation rising |
The following is an imaginary diary entry written by US president. This diary is part of Global Trends 2025, which was written by the US National Intelligence Council
80
The
81
The
82
Global wealth and economic power will shift from West to East.
83
84
The transition from old fuels to new will be slow, as will the development of new technologies that present feasible alternatives to fossil fuels or help eliminate food and water problems. All current technologies are inadequate, and new ones will probably not be commercially possible by 2025