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问题 选择题
已知集合A={x|y=
log
1
2
x
}，B={y|y=(
1
2
)x，x＞1}，则A∩B=（　　）
A．{x|0＜x＜
1
2
}		B．{y|
1
2
＜y＜1}		C．{y|0＜y＜1}D．∅
答案

∵集合A={x|y=

log
1
2
x
}={x|0＜x≤1}    集合B={y|y=（
1
2
）x，x＞1}={y|0＜y＜
1
2
}

∴A∩B={x|0＜x＜

1
2
}

故选：A．

单项选择题

参与固有性免疫应答的免疫分子是（）

A.TCR

B.BCR

C.补体

D.抗体

E.NK
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单项选择题

The following information has been gathered about a firm: LIFO inventory = $10000 Beginning LIFO reserve = $ 2500 Ending LIFO reserve = $ 4000 LIFO Cost of goods sold = $15000 LIFO net income = $ 1500 Tax rate is 40% What is the FIFO net income

A．

A. $ 2400.

B．

B. $ 4000.

C．

C. $ 2800.
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