单项选择题
A.is made up of B.is absorbed in C.is exposed to D.is known as
Petroleum is a result of the（）of plant or animal matter...
单项选择题Petroleum is a result of the（）of plant or animal matter in areas which are slowly subsiding.
A.depression B.description C.destruction D.deposition
They do this by doing well-informed about their subject...
单项选择题They do this by doing well-informed about their subjects, being honest in what they say, by using sound evidence, and by employing（）reasoning.
A.valley B.value C.vary D.valid
The interaction of these seven elements is what determi...
单项选择题The interaction of these seven elements is what determines the（）in any instance of speech communication.
A.outcome B.income C.become D.welcome
