第2题: [单项选择]A on the plane
B at the bank
C at the airport
D at the office
E at the theatre
F at the hotel
G at the customs
H on the bus
参考答案:B 答案解析:Man: Please sign your name on the check and don’t forget the date. Then give me the check and your d
第12题: [单项选择]D/G易位型21-三体综合征最常见的核型是() A. 46,XY(或XX),-13,+t(13q21q) B. 46,XY(或XX),-14,+t(14q21q) C. 46,XY(或XX),-15,+t(15q21q) D. 46,XY(或XX),-21,+t(21q21q) E. 46.XY(或XX),-22,+t(21q22q) 参考答案:B 答案解析:易位型21-三体综合征,D/G易位最常见。D组中以14号染色体为主,核型为46,XY(XX),-14,+t(14q21q)。