题目内容

[ A] found
[ B ] caught
[ C ] punished
[ D] attacked

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何谓限性遗传和从性遗传。

通过核代换所选育出来的不育系，非轮回亲本提供基因，轮回亲本提供基因，形成质核互作类型不育系。

[ A] simple
[ B ] sudden
[ C] unusual
[ D ] interestin

The "tissue factories" in the second paragraph most probably refers to
[ A] the five genetically identical piglets.
[ B] places for the production of tissues.
[ C] animals whose organs would be used for human consumption.
[ D] animals which would be raised in quantity for transplant materials.