What is the most well-known synthetic opioid?
a) LSD
b) heroin
c) Valium
d) cocaine
Question 2
Relative to other disadvantaged children who attended a different pre-school or no preschool, Head Start children
a) had significantly improved social-cognitive abilities and motor impulsivity.
b) had significantly higher overall IQ's.
c) were less socially proactive.
d) had similar impulsivity problems.
