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小升初英语专项复习讲与练（通用版）-[第48讲] 阅读步步高（九）（含答案）
Sudoku
The 200-Year-Old Puzzle
Sudoku, the popu lar puzzle that uses the numbers 1-9, might not be very new. According to some websites, Sudoku is based on the work of Leonard Euler, an 18th-century Swiss mathematician. Euler created “Latin Squares”, a grid in which every number or symbol appears once in each row or column.
In the 1970s a series of puzzles called “Number Place” appeared in a puzzle magazine by an American publisher. The puzzles were similar to Euler’s “Latin Squares”: every number could be used only once in each row or column. In 1984 a Japanese publisher saw the puzzles and was impressed: he made them easier, called them “Sudoku” (meaning “single number” in Japanese) and published them in a book. The puzzles continued to appear in the American magazine and in Japanese books, but nobody showed much interest in them.
That began to change in 1997 when Wayne Gould, a New Zealander working in Hong Kong, saw a Sudoku book in a bookshop and was fascinated by it. In October 2004 he persuaded The Times to publish one of the puzzles.
It was an instant success… and now you can find Sudoku puzzles in most British newspapers, on the Internet, and even on mobile phones. There are also monthly Sudoku magazines and even a Sudoku puzzle on BBC Radio 4’s Today programme, where the numbers are read aloud.
根据短文内容，选出正确答案
1．Number puzzles were first printed in the United States ____________.
A．in the 1700s
B．in the 1970s
C．in 1984
2．The American publisher called the puzzles ____________.
A．“Euler’s Squares”
B．“Latin Squares”
C．“Number Place”
3．When the puzzles first appeared in Japan, they were ____________.
A．not difficult en ough
B．not called Sudoku first
C．easier than the American puzzles
4．Between 1984 and 2004, the puzzles ____________.
A．became very popular in the USA
B．became very popular in Japan
C．existed, but were not very popular
5．Wayne Gould convinced The Times ____________.
A．to publish a Sudoku book