Comprehension Passages

346-The people studied by the researchers………. .

***A)participated in the experiment at their own will

B)suffered from insomnia

C)were having difficulty getting up early

D)were unable to wake up by other means

E)came from similar backgrounds

347-It seems that adrenocorticotropin………… .

A)exists in higher levels in people who wake up very early

***B)is produced by the body some time before a person wakes up

C)can't be measured without waking up the person being studied

D)is used by doctors for people who have difficulty getting up

E)is responsible for causing sleeplessness in a number of people