Human behavior is mostly a product of learning ________ the behavior of animals dependsmainly on instinct.
A、soD
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Becareful,_______you'llfalldown.
It is useful to science _______ the earth as an object in space.
If you want to find a decent location for your own home, ________ Mr. Smith for advice.
Shehadclearlyno________ofdoinganywork,althoughshewasverywellpaid.
The address book ________ the email addresses of your friends or groups of colleagues.
