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【单选题】
Our explanation seemed only to have______his confusion. He was totally at a loss as to what to say.A.
brought up
B.
added to
C.
worked out
D.
directed at
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举一反三
【单选题】An atom is a basic structural unit of matter， the smallest particle of an element _________ into chemical combination.
A.
that can enter
B.
can it ente
C.
when entering it can
D.
that enters can
【简答题】The versatility of chemical engineering originates in training to the practice of breaking up a complex process into individual physical steps, called unit operations, and into the chemical reactions.
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