Take this test

>> This was developed as an age test by an R&D
>> department at Harvard University.
Take your time and see if you can
>> read each line aloud without a mistake.
>> The average person over 40 years of age can't do it!
>>
>> 1. This is this cat
>> 2. This is is cat
>> 3. This is how cat
>> 4. This is to cat
>> 5. This is keep cat
>> 6. This is an cat
>> 7. This is old cat
>> 8. This is chap cat
>> 9. This is busy cat
>> 10. This is for cat
>> 11. This is forty cat
>> 12. This is seconds cat
>>

>> Now go back and read the third word in each line from the top
down.