【題目】There are fewer and fewer tigers in India. The situation will continue ________ humans stop hunting them for their fur and bones.
A.unless
B.if
C.because
D.since

【答案】A
【解析】句意：在印度老虎越來越少。除非人類停止為獲取皮毛和骨骼而獵殺它們，否則情況將繼續(xù)惡化。A. unless除非，如果不；B. if如果；C. because因為；D. since自從。結(jié)合句意理解，答案為A。

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