0.20mol·L-1NaCO3的pH(H2CO3的pKa1=6.38,pKa2=10.25)为11.77。( )
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Which of the following is not a Transitional Phrase?
A. for example
B. in case
C. on this occasion
D. as an illustration
If life is about survival of a species — and intelligence is meant to serve that survival — then we can’t compare with pea-brained sea turtles, ______ were here long before us and survived the disaster that wiped out the dinosaurs.
A. which
B. that
C. what
D. this
Generally speaking, the structure of an essay includes _______.
A. introduction
B. body
C. conclusion
D. paragraphs
When selecting examples for an essay, you should ________.
A. select the examples that are relevant and persuasive
B. try to choose typical examples
C. use the formal words
D. use the informal words