第三节One possible version:Work plays an extremely important role in Americanculture. sope ople find retirement difficultas they may feeluseless without jobs. Retirement can also bring financialproblems as Social Security cheeks dont provide enoughmoney. However, some senior citizens feel happy aboutretirement as they finally get time to do what they reallywant. American government is solving retired citizensproblems and considering their special needs, which is wiseand necessary, because everyone will get oid.

1.B解析:T噬菌体属于病毒,其核酸只有DNA,∧错误。酵母菌属于真核生物,肺炎双球菌属于原核生物,真核细胞和原核细胞结构的主要区别是有无细胞核,B正确。T4噬菌体没有细胞和细胞器,C错误。T4噬菌体不能进行细胞呼吸,D错误。

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