Attention to human speech can be demonstrated in infants
a. during the embryonic prenatal stage.
b. within days after birth.
c. by the age of two months.
d. by the age of six months.
Question 2
The principle of converging evidence means that
a. researchers search for the best single method to study a particular topic.
b. several methods applied to a topic should give consistent results.
c. careful research will avoid error.
d. only experiments should be done to get valid results.
