题目内容

矢量结构通过记录坐标的方式来表示点、线、面地理实体

A. 对
B. 错

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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

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