单项选择题

A．Because we can succeed only by making mistakes.
B．Because it is necessary for us to make mistakes if we want to be successful.
C．Because making mistakes means giving us more useful knowledge.
D．Because all the book knowledge is gained by making mistakes.
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单项选择题
A．To attract more sea animals to the testing site.B．To drive dangerous sea animals away from the testing site.C．To help track the sea animals being tested.D．To determine how sea animals communicate with each other.
A．To attract more sea animals to the testing site.
B．To drive dangerous sea animals away from the testing site.
C．To help track the sea animals being tested.
D．To determine how sea animals communicate with each other.
单项选择题
A．It lacks the necessary background information.B．The man should find the proper subject to research firstly.C．It will be finished in a short time.D．The man doesn’t know how to carry it on.
A．It lacks the necessary background information.
B．The man should find the proper subject to research firstly.
C．It will be finished in a short time.
D．The man doesn’t know how to carry it on.
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