题目内容：
Fromthepassagewecaninferthat_________. A．unprovenmedicinescannottreatchronicinsomniaatall
B．insomniasufferershavefoundcurablemedicines
C．sleepspecialistsandpsychologistscannotbetrusted
D．chronicinsomniastillbafflessleepexperts
参考答案：
答案解析：