单项选择题

The steady rise in the quality of our products owes much to the improvement of the management.（）

A．产品质量的平稳上升在很多方面取决于管理水平的改进。
B．我们产品的质量提高在很大程度上是因为管理水平的改进。
C．我们产品的质量稳步提高了，但在管理水平方面亏欠很多。
D．我们产品质量的稳步提高在很大程度上是由于管理水平的改进。

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单项选择题
Some people think depression is（）

A．a mental state that can be overcome without medicine
B．an illness that no medicine can cure
C．an experience everyone has in his life time
D．something you can avoid by leading a happy life
单项选择题
What do some doctors think is the real cause for people to feel depressed（）

A．Unhappy events happening in one's life.
B．A lack of balance of a chemical in one's body.
C．Difficulty in concentrating on something.
D．Sad feelings, lacking energy and eating disorder.
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