单选题
Which of the following is true about habits according to the passage?
They are natural endowments to living creatures.
They are more important than instincts to all animals.
They are subject to the formative influence of the environment.
They are destined to open out a much more far-reaching possibility in the evolution of human beings.
单选题
What can be inferred from the example of the ant-lion in the first paragraph?
Instincts of animals can lead to unreasonable reactions in strange situations.
When it is engaged in a chain actions it cannot be interrupted.
Environment and heredity are two supplementary factors in the evolution of insects.
Along the lines of evolution heredity becomes less and environment more important.
单选题
I have been for years troubling the pages of historians, to find out what our fathers have done to the native Americans, but I must say, that my researches have _____ been to no effect.
therefore
hitherto
however
nevertheless
单选题
After trying several times, the customer who was injured _____ to see the general manager of the supermarket.
managed
succeeded
won
attempted
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