【名词&注释】
基因型(genotype)、细胞有丝分裂(cell mitosis)、诺贝尔奖金(nobel prize)、应当是(should be)
[单选题]某小岛上原有果蝇20000只，其中基因型VV、Vv和vv的果蝇分别占15%、55%和30%。若此时从岛外入侵了2000只基因型为VV的果蝇，且所有果蝇均随机交配，则 代中V的基因频率约是
A. 43%
B. 48%
C. 52%
D. 57%
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举一反三：
[单选题]Why was David able to get the job in the company?
A. He had done well in all his exams.
B. He had written some computer programs.
C. He was good at playing computer games.
D. He had learnt to use computers at school.
[单选题]ForthefirsttwoyearsinNewYork,theauthor_________.
A. oftenlostherwayB．didnotthinkaboutherfuture
B. studiedinthreedifferentschools Dgotonwellwithherstepfather
[单选题]
A. establish
B. form
C. develop
D. promote【解析】根据与名词the Nobel prizes的搭配，又结合常识，应当是(should be)“设立”诺贝尔奖金。
[单选题]In the spoken English of some areas in the US, the "r" sounds at the end of thewords______.
A. are dropped
B. drop
C. are being dropped
D. have dropped
[单选题]采用洋葱根尖纵切片来观察细胞有丝分裂过程，在( )易找到处于分裂期的细胞。
A. 根冠
B. 分生区
C. 伸长区
D. 成熟区
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