正确答案: D

种皮过于坚硬

题目：用浓硫酸处理苋属植物种子可打破休眠，是因为该种子休眠的原因是( )。

解析：D

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举一反三的答案和解析：

[单选题]The children loved their day trip, and they enjoyed the horse ride . ks5u ks5u

most

解析：考查形容词(immediate)、副词等(most、much too与too much的区别)

[单选题]

delighted

[单选题]BComputer programmer David Jones earns ￥35,000 a year designing new computer games, yet he cannot find a bank ready to let him have a credit card (信用卡). Instead, he has been told to wait another two years, until he is 18. The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David’s firm releases (推出) two new games for the fast throwing computer market each month.

He has a handsome income. D． He graduated with six O-levels.

[多选题]下列植物中有性生殖产生担孢子的有( )。

黑粉菌

猴头菌

解析：BD

[单选题]薯蓣科植物具经济价值的器官通常是( )。

根状茎或块茎

[单选题]在植物的生活史中，具异形世代交替的类群的( )在形态和构造上显著不同。

孢子体和配子体