填空题

Bipolar disorder is characterized by cycling mood changes. Most[y, such changes are gradual.

【参考答案】

Y

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问答题

解释题目，指出你对题目的理解；2. 举例论证你的观点；3. 总结全文，得出结论。

填空题

A depressive disorder is an illness that involves mood and thoughts only.