题干

有关单倍体的下列叙述中,正确的是(   )

A:单倍体是体细胞中含有一个染色体组的个体

B:单倍体是体细胞中含有单数染色体组的个体

C:单倍体是体细胞中含有本物种配子染色体数的个体

D:单倍体是体细胞经过离体组织培养发育成的个体

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答案(点此获取答案解析)

C

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Tuesday,13th September

    I arrived in New York two weeks ago.I am writing my diary(日记)in English because my English teacher Rachel says it is a good way to practise English.So far, I like New York and my school.I have three classes a day.Most of my classmates come from Japan,South Korea,Spain,Germany and Australia.There aren't many Chinese students.so I have to use English most of the time.I am learning a lot!I am living in student housing,and I have my own comfortable room.

Thursday.20th October

    My English is hopeless!I was on the bus this morning and a man spoke to me,but I couldn't understand him.I was so embarrassed(尴尬的).Why is my English improving so slowly?I want to make lots of American friends,but this isn't happening so easily.I'm a shy girl.It is hard for me to talk to some people,even my classmates!I like them,but sometimes I can't understand them very well.I think I'm feeling homesick(想家的).I miss my friends and family.

Thursday.27th October

    I went to a school party last Friday and it was great.I talked with a Japanese boy named Kenji,a German girl named Wendy and an Italian girl named Carla.We talked about our countries' customs (风俗)and our experiences in America so far.We are going to walk around New York together this weekend.Also, Kenji wants me to write for the student newspaper here at school.Maybe things are getting better!

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