【名词&注释】
猴头菌(hedgehog fungus)、经济价值(economic value)、信用卡(credit card)、孢子囊(sporangium)、根状茎(rhizome)、种子休眠(seed dormancy)、浓硫酸处理(dense sulfuric acid treatment)、世代交替(metagenesis)、植物种子(plant seed)、孢子体和配子体
[单选题]用浓硫酸处理(dense sulfuric acid treatment)苋属植物种子(plant seed)可打破休眠，是因为该种子休眠的原因是( )。
A. 种子内的胚尚未成熟
B. 种子的后熟作用
C. 存在抑制性物质
D. 种皮过于坚硬
查看答案&解析
举一反三：
[单选题]The children loved their day trip, and they enjoyed the horse ride . ks5u ks5u
A. most
B. more
C. less
D. little
[单选题]
A. disappointed
B. worried
C. honoured
D. 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.
A. But David’s biggest headache is what to do with his money. Even though he earns a lot, he cannot drive a car, take out a mortgage (抵押贷款), or get credit cards. David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. “I got the job because the people who run the firm knew I had already written some programs,” he said. David spends some of his money on records and clothes, and gives his mother 50 pounds a week. But most of his spare time is spent working.
B. “Unfortunately, computing was not part of our studies at school,” he said. “But I had been studying it in books and magazines for four years in my spare time. I knew what I wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway.” David added: “I would like to earn a million and I suppose early retirement (退休) is a possibility. You never know when the market might disappear.”
C. 60. In what way is David different from people of his age?
D. He often goes out with friends.B． He lives with his mother.
E. 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( )。
A. 麦角菌
B. 黑粉菌
C. 白粉菌
D. 猴头菌
[单选题]薯蓣科植物具经济价值的器官通常是( )。
A. 叶
B. 花
C. 果或种子
D. 根状茎或块茎
[单选题]在植物的生活史中，具异形世代交替(metagenesis)的类群的( )在形态和构造上显著不同。
A. 孢子囊和配子囊
B. 孢子体和配子体
C. 孢子和配子
D. 精子和卵细胞
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