正确答案: B

错误

题目：裸子植物的雄配子体只具一个精子，所以不能进行双受精。( )

解析：B

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举一反三的答案和解析：

[单选题]33________

airplane

[单选题]若集合A={x|-2x1}，B={x0x2}则集合A ∩ B=（ ）

{x|0x1}

[单选题]______________________________________________________________________A dictionary entry has many elements: multiple definitions, syllabication, preferred spelling and pronunciation (some words have more than one acceptable spelling and pronunciation), and part-of-speech labels. Some entries also include plurals and capitalized forms, synonyms, antonyms, and derivatives. Americanisms and etymologies may be provided along with usage notes, cross-references, and idioms.

Elements under a word item

[单选题]关于万有引力及其应用，下列表述正确的是

人造卫星在地面附近绕地球作匀速圆周运动所必须具有的速度，称为第一宇宙速度

[单选题]双韧维管束中，内韧皮部与初生木质部之间不存在形成层。( )

正确

[单选题]禾谷类作物的叶包括( )等部分。

叶鞘、叶舌、叶耳、叶片