【B4】______A．hatchB．patentC．duplicateD．train

Decreasing returns to scale may arise from ______.A．specialization of inputs.B．duplication

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The train from Shanghai is pulling ______.A．inB．outC．offD．back

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— I usually go there by train.— _________________A、You could do more training.B、The boat

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— What time does the train leave？— _________________.A: On TuesdayB; At half past fiveC;

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_________(63)A.establish B.makeC.build D.train

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_________(59)A.exercise B.training C.strength D.m

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【B4】______A.supplyB.provideC.supportD.offer

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