遗传变异
参考答案:
由突变和重组引起的遗传变异使群体内各个体间产生差异。(遗传变异是进化的基础。)
任务型阅读。
I have got some good friends. (A) They have _____ (不同的习惯). Sam likes getting up at six
o'clock. Then he does sports. (B) 他最喜欢的运动是跑步. He doesn't like reading novels. Betty likes
music. She buys (C) _____ CDs. Her favourite singer is Britney Spears. She has got an MP3 and often
(D) _____ . Sara likes playing table tennis. Zhang Yining is her favourite player. (E) But she doesn't like
playing football. She thinks it is too tiring (累人的).
1. 将(A)处完成句子:
_____________________________________________________
2. 将(B)处翻译成英文:
3. 选择正确的选项放入(C)处: _____
A. a lot
B. lots of
C. much
D. any
4. 在(D)处填上一个短语,使句意完整:
5. 将(E)句翻译为汉语:
下列关于平静呼吸过程的叙述,错误的是
A.肺通气的原动力是呼吸运动
B.吸气和呼气过程均是主动过程
C.呼气时,肺内压大于大气压
D.吸气时,肺内压小于大气压
E.吸气末和呼气末肺内压等于大气压