单项选择题

与淋巴结具有同种功能的器官是（）。

A.骨髓
B.脾脏
C.胸腺
D.腔上囊

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What does the writer want to tell us in the fourth paragraph？A.The U．S．is richer than IndiA.B.Chickens were made to mature in shorter time and able to produce more eggs．C.There are 12 states in the Midwestern U．S．D.U．S．is able to increase food production with scientific techniques．

A.The
B.S．is
C.
B.Chickens
D.
C.There
E.S．
D.U．S．is

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Given the present growth rate of the world’s population and our ability to produce food_______．A.the United States will be able to feed half the world by 2025B.the future will see no more hungerC.we will encounter very serious problem in the near futureD.the developed nations will change in the near future

A.A.the
B.the
C.we
D.the

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