单项选择题

Young scientists cannot realize______ soon that existing scientific knowledge is not nearly so complete, certain and unalterable as many textbooks seems to imply.

A．so
B．very
C．too
D．such
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单项选择题
When preparing elementary school test, care should be taken______.
A．not to make the vocabulary more difficult than necessary
B．not to make the vocabulary that difficult
C．so as to not make the vocabulary part too hard
D．in not making the vocabulary a problem in terms of it difficulty
单项选择题
The barrier of language keeps many scientists in prolonged ignorance of work of immediate importance to them ______at present in many countries.
A．doing
B．to be done
C．having done
D．being done
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