正确答案: A

共生

题目：根瘤细菌与豆科植物根的关系是( )。

解析：A

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举一反三的答案和解析：

[单选题]DImagine，one day，getting out of bed in Beijing and being at your office in Shanghai in only a couple of hours，and then，after a full day of work，going back home to Beijing and having dinner there．

China and the countries involved will benefit from the project in various ways

[单选题]有关神经系统的叙述，错误的是

位于大脑皮层的呼吸中枢是维持生命的必要中枢

[单选题]处于不萌发状态的种子称为休眠种子。( )

错误

[单选题]古代有“闽人以海为田”之说，这种说法突出反映了福建人

四海为家的生活方式

[单选题]41________

announced

解析：

本句句意应为“典礼的主持人清晰地大声宣布下面表演的是我们班。”表示“宣布”用announced。

[单选题]单叶的叶柄与复叶小叶柄基部均有腋芽。( )

错误

[单选题]24 As a child, Jack studied in a village school，——is named after his grandfather．

which