单项选择题

How does placebo work

A．It fights the virus in human bodies.
B．It works through people's mental power.
C．It controls the hormones in human bodies.
D．It strengthens people's immune system.

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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

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.