[填空题]What is a drug Most people likely think (1)______
think there’s a perfectly simple answer to this
question. In fact, if one carries a quick survey on (2)______
any street corner, one finds that according to the
great vast majority of people, there are two groups (3)______
of drugs: those prescribed by doctors, and those
which people take for non-medical use. As medicine
and the medical profession are generally self-respected
there aren’t objections to the use of prescribed (4)______
drugs. What most people don’t realize is that while
prescribed while prescribed drugs are usually thought
beneficial, they can also present serious problem. (5)______
There were many people addicted by tranquilizers (6)______
before doctors began to prescribe them: now there
being literally millions who depend on them. The (7)______