遗传性疾病分为()
A．线粒体遗传病
B．单基因遗传病
C．多基因遗传病
D．染色体病
E．酶缺陷病
参考答案：A, B, C, D
The manager has got a good business ______, so the company is doing well.
A．idea
B．sense
C．thought
D．thinking
He held the young man _______ in his arms after a good _______ handshake. [ ]
A. tightly…. firmly
B. firm …. tight
C. tight ….firm
D. firmly…
