The upper atmosphere is believed to consist of a number of roughly concentric lay-
A.plainly
B.repeatedly
C.nearly
D.changeably
A.plainly
B.repeatedly
C.nearly
D.changeably
A、/a/
B、/i:/
C、/e/
D、/aɪ/
A、Cautious
B、Simple-minded
C、Watchful
D、Sophisticated
A、snail wheel
B、rail bed
C、output width
D、sunflower disk
A、avoiding jargons
B、avoiding ambiguity
C、using clear structure
D、having clear argument
A、by using clear structure
B、by ensuring word accuracy
C、by omitting illustrations and tables
D、by deleting extraneous expressions
A、without subjectivity
B、no unfounded claims
C、avoiding implicit expression
D、free from personal biases
A、by close reasoning
B、by using complete sentences
C、by using tight connection
D、all of the above
A、past tense
B、present tense
C、present perfect tense
D、all of the above
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