单项选择题

Anna was reading a piece of science fiction, completely （） to the outside world.

A．having been lost
B．to be lost
C．losing
D．lost

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单项选择题
Apart from caring for her children, she has to take on such heavy （） housework as carrying water and firewood.

A．time-consumed
B．timely-consumed
C．time-consuming
D．timely-consuming
单项选择题
Vitamins are complex （） that the body requires in very small amounts.

A．matters
B．materials
C．particles
D．substances
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