单项选择题

Molds cannot produce their own food ______ their nourishment from living on dead organic matter or on other living matter.

A．obtain
B．obtaining
C．but obtain
D．is obtained
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单项选择题
Petrol is manufactured from the ______ oil we take out of the ground.
A．crude
B．raw
C．rough
D．tough
单项选择题
Hot air accompanied by high relative humidity feels warmer than ______.
A．is it actually
B．it actually is
C．actually it is.
D．is actually it
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