正确答案: B

孢蒴

题目：地钱的下列结构中，属于孢子体世代(染色体为2n)的是( )。

解析：B

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举一反三的答案和解析：

[单选题]Why was the woman at the airport?

She was seeing the man off.

[单选题]嫁接的成活率与两植物的亲缘关系有关，一般来说，( )间的嫁接成活率最大。

品种

[单选题]《史记》载：汉武帝时，“公孙弘以《春秋》白衣为天子三公，封以平津侯。天下之学士靡然乡风矣”。该材料主要表明

儒学地位显著提高

[单选题]

relief

[多选题]Directions: Beneath each of the following sentences there are four choices markedA,B, C and D. Choose the one answer that best completes the sentence.

covering B． covered C． cover D． to cover

calling