One single nonverbal cue cannot be reliably interpreted to mean the same thing across situations

A 22-month-old saying "more cookie" instead of "cookie more" shows an initial knowledge of __________________

a. syntax b. sense of self c. vocabulary d. phonetics

In situations where one must work with intact groups but where there are also ethical implications concerning depriving both groups of the benefits of the experimental treatment, one uses a randomized design with a __________ control group

a. zero b. preexperimental c. wait-list d. placebo