【正确答案】正确答案： A Difficult Calculation A study shows that a group of second year high school students last spring / had the same scores on the same maths test that first year students had six years ago. / In the opinion of the researchers / the main factor influencing this decline is / the pupils' inability to do mental arithmetic / as a result of the emphasis on calculators. / But the government gave its blessing to the use of calculators in schools / in a report published five years ago. / The report suggests that not only should calculators be allowed in schools / but they should be introduced as a compulsory piece of equipment for every secondary school pupil. /