题干

科学家将控制某药物蛋白合成的基因转移到白色来亨鸡胚胎细胞的DNA中,发育后的雌鸡就能产出含该药物蛋白的鸡蛋,在每一只鸡蛋的蛋清中都含有大量的药物蛋白;而且这些鸡蛋孵出的鸡,仍能产出含该药物蛋白的鸡蛋,据此分析错误的是(    )

A:这些鸡是转基因工程的产物

B:这种变异属于可遗传的变异

C:该过程运用了胚胎移植技术

D:该种变异属于定向变异

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C

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    I like travelling very much.____They are wonderful adventures filled with new sights and experiences. And my wife and I have another trip in the planning stages.

    We're home now and have settled back into our daily routine of life.____ I find that when I am at home, particularly for a while when we have just returned from a trip, I feel very comfortable. Perhaps it is because everything around me is familiar and the daily routine is so much the same and I can move through it almost without thinking.____Perhaps it is because we can have meals at home instead of always being in restaurants, although it's nice to let someone else do the cooking, and because I can sleep in my own bed. There are times I think it would be nice to simply stop travelling and stay home.____

    Yet I guess I am probably a restless soul because I know that after I have been home for a while I will start to think about other places we might go and other things we want to see.____ We will travel again and we feel fortunate to be able to do so. Still, one of the best things about travelling for me is coming home. I'm very comfortable here at home even if it is difficult to say exactly why.

A. I enjoy local food while travelling.

B. I like being home,for whatever reason.

C. Perhaps it is because our friends are here.

D. And I enjoy my daily life at home so much.

E. It's lucky that my wife and I both love travelling.

F. The world is filled with people who are travelholic.

G. I have been fortunate enough to make trips to many countries.