简述脑功能的模块说。
Theboyranoutoftheclassroomwithouttheteacher's_______.
Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
已知，二次型的秩为2，(I)求实数a的值；(II)求正交变换x=Qy将f化为标准形.
Hardlyhadhefinishedhisspeech________theaudiencestartedcheering.
