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【单选题】
假设某种二倍体植物 A 的细胞质在遗传上不同于植物 B。为了研究核-质关系，想获得一种植物，这种植株具有 A 的细胞质，而细胞核主要是 B 的基因组，应该怎样做？A.
A×B 的后代连续自交
B.
A×B 的后代连续与 B 回交
C.
A×B 的后代连续与 A 回交
D.
B×A 的后代连续与 B 回交
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【单选题】Some weeks ago, riding in a cab from Boston to Cambridge, my driver turned and asked me what I did for a living. 'Teach English,' I said. 'Is that so?' The young man continued. 'I was an English major...
A.
To help graduates of history major become successful businessmen.
B.
To provide liberal arts graduates with a method of meeting effectively the challenge in employment.
C.
To extend their knowledge learnt in the college.
D.
To moderate the tension between liberal arts and vocational faculties.
【单选题】I_______to Cambridge in years, not since we graduated.
A.
haven’t been back
B.
didn’t go
C.
have been back
D.
went back
【简答题】阅读理解 I paid a visit to Cambridge last January. Though the trip took me 5 hours and it rained the whole day with strong winds there, the town deserved a visit. The bus started at 6:10 a. m. It stopped...
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