A.On every continent but not in every country.
B.On the continents with developed countries.
C.On the continents with developing countries.
D.On every continent and in every country.
A.Harvard MK I was general-purpose electromechanical programmable computer.
B.Colossus used electronic valves.
C.They used punched cards for their main, non-volatile storage.
D.Scientists in the U. K. and the U. S. A worked together in 1943 to develop the first electronic computers.
A.One that follows a clear formula.
B.One with evidence leading to conclusion.
C.One full of descriptive words.
D.One with shorter but well-organized sentences.
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