A．Gardening and landscaping.B．Retailing.C．Financing.D．Child-care.
A. Gardening and landscaping.
B. Retailing.
C. Financing.
D. Child-care.
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A．Those who have heart attacks.B．Those who desire to lose weight.C．Those who have spare
A. Those who have heart attacks.
B. Those who desire to lose weight.
C. Those who have spare time.
D. Those who have inactive jobs.
____
A. 证明软件系统中存在错误
B. 判定软件是否合格
C. 证明软件的正确性
D. 尽可能多地发现软件系统中地错误
______
A. 255.255.255.224
B. 255.255.255.240
C. 255.255.255.248
D. 255.255.255.252
A．whereB．howC．thatD．what
A. where
B. how
C. that
D. what
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