15. D。 综上所述，减肥也就意味着失去了很多金钱。
Many people go to school for an
education. 1 learn languages, history, geography,
physics, chemistry and maths. Others go to school to learn a skill so that they
can 2 a living. School 3 is
very important and useful. Yet no one can learn everything from school. A
teacher, no matter how much he 4 , can not teach his students
everything they 5 to know. The teacher’s job is to show
his students how to read and how to 6 . So much more is to be
learned 7 school by the students themselves.
It is always more important to
know how to study by 8 than to memorize(熟记)some facts or formula(公式). It is
9 quite easy to learn a 10 fact in history
or a formula in mathematics. But it is very difficult to use a formula
in 11 out a maths problem. Great scientists, such as
Einstein, Newton
and Galileo, didn’t learn many things from school. But they were all
so 12 that they invented so many things for mankind.
The 13
for their success is that they knew how to study. They read books that were
not 14 at school. They worked hard all their lives,
wasting not a single moment. They would ask many questions as they read and
they did thousands of 15 .