Text-1 Read the text. Then choose the correct answer for questions 1-2

Read the text. Then Choose the correct answer for each question below (163-165).
An average child of 5 years old uses only 1500 of the 15000 of "dictionary" words that modern language contains. But this small treasury is used very intensively, by him during the years of learning, at the rate of about 1000 words an hour or from 7000 to 15000 words each day for an active child. School quickly increases his vocabulary, but leaves him with less opportunity for using it. At 10 years old, his treasury amounts to 7000 words, of which about 30% are used actively - the remainder is seldom or never used and in an hour he will use about 700words. By tile time lie enters university, his word inventory will have grown to 20000 and on graduation to 600000,but of these only 10% 20% will be in active use.