单项选择题

A．It is calcium, not vitamin D, which is the direct source of hard bones.
B．Vitamin C can be found in all kinds of green vegetables.
C．The outside of rice also contains certain vitamins.
D．People with enough B vitamin seldom have nerve’s troubles.
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单项选择题
A．He is looking at something that the woman showed him.B．He is cooking in the kitchen.C．He is reading.D．He is getting into the kitchen.
A．He is looking at something that the woman showed him.
B．He is cooking in the kitchen.
C．He is reading.
D．He is getting into the kitchen.
单项选择题
A．A system which trains computer experts.B．A system which trains doctors.C．A group of experts who can provide professional advice.D．A computer program which can provide professional advice.
A．A system which trains computer experts.
B．A system which trains doctors.
C．A group of experts who can provide professional advice.
D．A computer program which can provide professional advice.
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