单项选择题

The word "gruelling" in the first paragraph probably means ______.

A．intermittent.
B．incessant.
C．toilsome.
D．numerous.
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单项选择题
ECT remains an effective antidepressant treatment partly because ______.
A．it can stimulate the patient to be more active.
B．it can stimulate the brain to grow new blood vessels.
C．it can help a patient recall what has happened.
D．it can help a patient to come to his consciousness.
单项选择题
The best title for the passage would be ______.
A．Antidepressant Treatments.
B．ECT an Effective Treatment.
C．How ECT Works
D．Why Is ECT Effective
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