Mental Activities Help Save MemoryDoing mental activities is helpful. Reading books and writing at any age may save memory, a new _____（31）finds.The study was conducted by some American neurologists（神经病学家）. It _____（32）294 people.They were given _____（33）on memory and thinking. They had the tests once a year for six years. They were also asked to talk about their mental activities during childhood, in their youth, during middle age and at their _____（34）age.Some of those people did mental activities both _____（35） and late in life They had a slower_____（36）of decline in memory than the others. The others _____（37） did such activities. Their rate of decline in memory was 48% _____."Mental activities like reading and writing are great. They _____（39）bring benefits. We shouldn't _____（40）their effects on our children, ourselves and our parents," said Robert Wilson, lead author of the study._____.A．earlyB．testsC．seldomD．taughtE．fasterF．produceG．studyH．currentI．involvedJ．neglectK．rateL．really