单项选择题

A virus, often too small to be seen except with a powerful microscope, （）diseases.

A．cause
B．is caused
C．causes
D．is causing

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单项选择题
The researchers have come up with numerous explanations to （）their failures.

A．excuse
B．justify
C．admit
D．avoid
单项选择题
E-commerce has witnessed a （）growth these years.

A．fixed
B．stable
C．steady
D．regular
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