A. CONTAMINATE B. SUPERVISOR C. INVESTIGATE D. CO...

75. A. contaminate B. supervisor C. investigate D. convenientVII. Reading Comprehension 1: Read the passage and then choose the correct answers:It is said that mathematics is the base of all other sciences, and that arithmetic, the science ofnumbers, is the base of mathematics. Numbers consist of whole numbers (integers) that are formed by thedigits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 and by the combinations of them. For example, 247 — two hundredand forty seven — is a number formed by three digits. Parts of numbers smaller than 1 are sometimesexpressed in terms of fraction, but in scientific usage they are given as decimals. This is because it iseasier to perform the various mathematical operations if decimals are used instead of fractions. The mainoperations are: to add, subtract, multiply and divide; to square, cube, or raise to any other power; to take asquare, cube, or any other root, and to find a ratio or proportion between pairs of numbers or a series ofnumbers. Thus, the decimal, or ten-scale, system is used for scientific purposes throughout the world, evenin countries whose national systems of weights and measurements are based upon other scales. The otherscale in general use nowadays is the binary, or two-scale, in which numbers are expressed bycombinations of only two digits, 0 and 1. Thus, in the binary scale, 2 is expressed as 010, 3 is given as Oh,4 is represented as 100, etc. This scale is perfectly adapted to the “off-on” pulse of electricity, so it iswidely used in electronic computers. Because of its simplicity it is often called “the lazy schoolboy’sdream.”!