单项选择题

A．Because he wanted to make more money.
B．Because he was fired by the school because he sold pens to his students.
C．Because he was proud of his repair skills.
D．Because he felt the pens he sold needed to be improved.
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单项选择题
A．When people consider marriage an important part of their lives.B．When the costs of getting a divorce become unaffordable.C．When the current marriage law is modified.D．When husband and wife understand each other better.
A．When people consider marriage an important part of their lives.
B．When the costs of getting a divorce become unaffordable.
C．When the current marriage law is modified.
D．When husband and wife understand each other better.
单项选择题
A．They defend the bone against viruses.B．They prevent oxygen from entering the bone.C．They break down bone tissue.D．They connect the bone to muscle tissue.
A．They defend the bone against viruses.
B．They prevent oxygen from entering the bone.
C．They break down bone tissue.
D．They connect the bone to muscle tissue.
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