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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Agriculture is undoubtedly the most important sector in the economies of most non-oil exporting African countries. It (62) about 30% of Africa’s GDP and contributes (63) 50% of the total export valu...
A.
changes
B.
difference
C.
variables
D.
variation
【单选题】Would you like to pay or by credit card? 请问您是付现金还是用信用卡?
A.
by cash
B.
on cash
C.
in cash
D.
with cash