矢量结构通过记录坐标的方式来表示点、线、面地理实体
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Busy________ she is,Rita________ two hours every Sunday afternoon to spend with her son.
A. though; sets out
B. as; sets aside
C. as; sets down
D. though; sets off
Ten years later I still keep in touch with my classmates ________ I've never met them.
A. now that
B. so that
C. even though
D. in case
Your parents are always there by you,_____you need them.
A. whenever
B. however
C. whatever
D. whoever
________a small number of Australians are bitten by spiders each year,most recover without any medical treatment.
A. While
B. Unless
C. When
D. Because