单项选择题

We now obtain more than two-thirds of our protein from animal sources, while our grandparents ______only one-half from animal sources.

A．originated
B．digested
C．deprived
D．derived
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单项选择题
I have never seen a more caring, ______group of people in my life.
A．emotional
B．impersonal
C．compulsory
D．compassionate
单项选择题
Today investigators are still far from______a master map of the vasculature of the heart.
A．constituting
B．decoding
C．drafting
D．encoding
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