单选题：Which country is the largest coffee producer?

题目内容：

Which country is the largest coffee producer? A．Brazil
B．Colombia
C．Ethiopia
D．Egypt

参考答案：

答案解析：

“some” in the last sentence of the first paragraph refers to

“some” in the last sentence of the first paragraph refers toA．some cocoa trees B

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设有如下关系表：则下列操作中正确的是（　　）A．T＝R∩S B．T＝R∪S C．T＝R×S D．T＝R/S

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Henry Manley had no idea at all why George Strong wanted to see him. A．right B．W

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执行以下程序段 a$="abbacddcba" For i=6 To 2 Step -2 　X=Mid（a,i,i）　Y=Left（a,i）　z=Right（a

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栈和队列的共同特点是A．都是先进先出 B．都是先进后出 C．只允许在端点处插入和删除元素 D．没有共同点

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