题目

某动物的基因型为AaBb，这两对基因独立遗传，若它的一个精原细胞经减数分裂后产生4个精子之一基因型为AB，那么另外3个分别是（  ） A.Ab、aB、ab B.AB、ab、ab C.ab、AB、AB D.AB、AB、AB   答案：B  一个精原细胞经减数分裂后产生4个精子，两种类型，两两相同。  Summer vacation is coming. Do you want to enjoy some films? Here are four great ones to be on show. New Times Movie Theatre 1. 10-year-old Tom should pay _______ if he watches Where are we going, Dad? A. ¥15 B. ¥20 C. ¥30 D. ¥35 2.If you love a super hero, you can watch _______. A. Where are we going, Dad? B. Ant-Man C. Finding Dory D. The Martian 3.Mike should get to the theatre before _______ to enjoy a cartoon film. A. 9:00 a.m. Saturday B. 2:00 p.m. Saturday C. 9:00 a.m. Sunday D. 3:00 p.m. Sunday 4. From The Martian we know that _______. A. there are many challenges in a forest trip B. Lang can protect the magic suit C. Dory experiences a lot under the sea D. the astronaut can live on the Mar