题目内容
（请给出正确答案）
[主观题]
You have just come back from the U.S. as a member of a Sino-American cultural exchange pro
gram. Write a letter to your American colleague to
1)express your thanks for his/her warm reception;
2)welcome him/her to visit China in due course.
You should write about 100 words.
Do not sign your own name at the end of the letter. Use "Zhang Wei" instead.
Do not write your address.
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而遗传图距为
。请问这种现象是正常的，还是不正常的?可否设计更精确的遗传分析实验解决这一矛盾?如何解决?并说明理由。
