酶生物合成的模式分是：同步合成型、延续合成型、中期合成型、（）
参考答案：滞后合成型
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On the whole, this passage is positioned to dwell on ______.
A．the overall picture of the HDTV sector
B．how the giant TV makers should offer better products
C．a lament over consumers' inability to use a high-end TV set
D．a criticism of the TV makers for doing nothing about a big problem
