单项选择题

The new biotechnology procedure discussed in this passage mainly concerns ______.

A．embryos
B．pigs, sheep and goats
C．commercial science
D．improvement of animal strains
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单项选择题
In the first sentence, to become commercially available means ______.
A．this procedure is available only on the market
B．this procedure can be used in producing better farm animals
C．This procedure can be used to promote business
D．People such as farmers can use this procedure in their production
单项选择题
The transgenic farm animals mentioned in this passage are ______.
A．pigs, cows and mosquitoes that have gone through the transgenic procedure
B．pigs, cows, sheep and chickens that have accepted additional genes
C．leaner pigs, poultry that produce pharmaceuticals and healthier sheep
D．leaner pigs, chickens resisting diseases and goats that produce milk with medicine in it
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