题目内容

关于贮精囊（ seminal vesicle ）和纳精囊（ seminal receptacle ）的叙述，错误的是：


  1. A.
    贮精囊是自体精子贮精和发育的器官，纳精囊主要接受异体精子
  2. B.
    纳精囊是自体精子贮精和发育的器官，贮精囊主要接受异体精子
  3. C.
    贮精囊和纳精囊是贮存精子的不同器官的名称
  4. D.
    每条环毛蚓都同时具有这二种器官
B
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You shouldn’t talk until ______ to.


  1. A.
    asking
  2. B.
    having asked
  3. C.
    to ask
  4. D.
    asked

All I have learned about the exam______ that three students faile D.


  1. A.
    is
  2. B.
    are
  3. C.
    will be
  4. D.
    have been

It is said that the book our Chinese teacher referred to is worth______.


  1. A.
    reading
  2. B.
    to read
  3. C.
    being read
  4. D.
    read

As it is known to all,______ attention you pay to your spelling,______ mistakes you might make.


  1. A.
    the less; the less
  2. B.
    the less; the fewer
  3. C.
    the less; the more
  4. D.
    the more; the more

甲和乙准备要一个孩子，但甲的哥哥有半乳糖血症（一种常染色体隐性遗传疾病），而且乙的外祖母也有此病。乙的姐姐的 3 个孩子都未患此病。那么甲和乙的第一个孩子患半乳糖血症的概率有多大？


  1. A.
    1 / 4
  2. B.
    1 / 2
  3. C.
    1 / 12
  4. D.
    3 / 8

人工选择和自然选择的共同选择基础是：


  1. A.
    生物的生存斗争
  2. B.
    人和自然界的选择力量
  3. C.
    生物的遗传和变异是普遍存在的
  4. D.
    生物均具有很强的繁殖能力
通常—种酶蛋白必须与某一特定的辅酶结合，才能成为有活性的全酶；反之，一种辅酶常可与多种不同的酶蛋白结合而成为具有专一性的酶。
—Can you come to help us with our work by 5 o'clock?
—I don't know if I can help; ________.
[     ]
A. that's a pity  
B. it all depends
C. you are welcome  
D. that's a pleasure

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