单项选择题

The tone of this passage is ______.

A．critical
B．factual
C．humorous
D．romantic
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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
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
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