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【单选题】
下列关于细胞工程的叙述中，错误的是A.
植物细胞融合必须先制备原生质体，原生质体融合完成的标志是产生新的细胞壁
B.
培养动物细胞可以检测有毒物质，通过检测细胞染色体变异程度来判断毒性强弱
C.
经细胞核移植培育出的新个体不只具有一个亲本的遗传性状
D.
植物组织培养和动物细胞培养过程中都需要无菌环境
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举一反三
【单选题】If it is generally acceptable as a medium of exchange then it
A.
must be a commodity.
B.
must be a precious metal such as gold or silver.
C.
is money.
D.
all of the above.
【单选题】Let us suppose the boundary between two States is a river, if it is navigable, and unless a treaty provides otherwise, the boundary is generally .
A.
one of the two banks of the river
B.
the mid-line of the river
C.
the mid-line of the principal channel
D.
the river bed
【简答题】Before I went to Yellowstone Park, I had never seen a black bear in the wild.
【简答题】运动性低血糖,如何处理?
【判断题】Later, mother bought me a pair of size 5, stuffing one shoe with toilet paper so it would fit my smaller foot. I went to the first dance. I managed to take a turn with a boy so tall that I couldn’t...
A.
正确
B.
错误
【简答题】How did I become known as a 'rubbish picker '? I never 36 rubbish before. I didn't care where it went or who cleaned it up. But two years ago, I started caring about it deeply. I lived near a fores...
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