单项选择题

A．It is to determine which food chain is the most efficient
B．It is to describe the food network among plants and animals.
C．It is to explain the process of photosynthesis (光合作用) in green plants.
D．It is to appeal to conservationists to protect endangered plant species.
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单项选择题
A．Married women do not have to feel guilty for not raising children themselves.B．Married women do not have to care about the pressure to have children.C．Married women should not work if they have got children.D．Married women can work even they have got children at home.
A．Married women do not have to feel guilty for not raising children themselves.
B．Married women do not have to care about the pressure to have children.
C．Married women should not work if they have got children.
D．Married women can work even they have got children at home.
单项选择题
A．To go to the school cafeteria.B．To go to the food stands outside the schoolC．To go to the supermarket.D．To go to the venders
A．To go to the school cafeteria.
B．To go to the food stands outside the school
C．To go to the supermarket.
D．To go to the venders
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