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听力原文：M: Ordinarily you never seem to be nervous. But why were you so nervous just now when the professor called on you? W: You know, I didn't enter my house until I found my key at 11 o'clock last night, so I didn't have enough time to preview my lessons. Q: Why did the woman feel nervous? (15)A.
She was afraid of the professor.
B.
She didn't enter her house.
C.
She didn't make full preparations for her lessons.
D.
She lost her key.
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【简答题】在F2代中有多少比例的后代高度和原来两个亲本(AABBCC和aabbcc)相等。
【简答题】AABBCC×aabbcc→F 1 (AaBbCc)，假定这3个基因在同一染色体上，且为完全连锁。则该F 1 可形成______种配子，如果3个基因两两间均为不完全连锁，则F 1 可形成______种配子。
【单选题】基因型为aabbcc的桃子重120克，每产生一个显性等位基因就使桃子增重15克，故AABBCC桃子重210克。甲桃树自交，F 1 每桃重150克。乙桃树自交，F 1 每桃重120～180克。甲乙两树杂交，F 1 每桃重135～165克。甲、乙两桃树的基因型可能是 [ ]
A.
甲AAbbcc，乙aaBBCC
B.
甲AaBbcc，乙aabbCC
C.
甲aaBBcc，乙AaBbCC
D.
甲AAbbcc，乙aaBbCc
【单选题】现有连锁图如下： ，那么AABBcc与aabbcc杂交的F 1 自交后代中产生AabbCc的频率为______。
A.
4.5%
B.
9%
C.
0.5%
D.
2.25%
【单选题】Look! She is coming here and there _____. [ ]
A.
goes the bus
B.
going the bus
C.
the bus goes
D.
the bus going
【简答题】Something must be wrong with the girl's She cant hear clearly A . nose B arms C. eyes D ears 2 . On Mother's Day, Cathy made a beautiful card as a___ for her mother. A. secret B. gift C. work D. task ...
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