单项选择题

Placebo and noeebo ______.

A．only exist in people's imagination
B．were medicines used by Latin people
C．are very effective in healing
D．are hated by both doctors and patients
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单项选择题
According to paragraph three, what can we learn about the experiment
A．30% of the patients take placebos.
B．The effect of placebo has nothing to do with the dose.
C．Patients feel still better if they are given two instead of one placebo.
D．Patients know they are taking placebos rather than real drugs.
单项选择题
How do doctors' expectations influence patients
A．Doctors tell patients explicitly whether they will heal or not.
B．Doctors tell patients secretly whether they will heal or not.
C．Doctors communicate their expectations through other people.
D．Doctors communicate their expectations unconsciously to patients.
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