单项选择题

A．The woman is an excellent cook.
B．The woman is a housewife.
C．Cathy helped a lot in cooking the dish.
D．The woman has never cooked before.
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单项选择题
It can be seen that present cloning techniques ________.
A．still have a 10ng way to go before reaching maturity
B．have been widely used in saving endangered species
C．provide insight into the question of nature vs. nurture
D．have proved quite adequate for the cloning of humans
单项选择题
It is implied in the passage that a theorist pursues science ______.
A．chiefly for changing the world
B．just for challenging the status quo
C．primarily for the benefits of humankind
D．mainly for playing the game of science
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