牵牛花的红花(A)对白花(a)为显性,阔叶(B)对窄叶(b)为显性。纯合红花窄叶和纯合白花阔叶杂交的后代再与“某植株”杂交,其后代中红花阔叶、红花窄叶、白花阔叶、白花窄叶的比依次是3∶1∶3∶1,遗传遵循基因的自由组合定律。“某植株”的基因型是A.aaBb B.aaBB C.AaBb D.Aabb
It is said that the number of forest Parks in Guangdong_____to more than 1,000 so far.( )
A.increaseB.increased
C.has increasedD.will increase
China is getting more and more independent of Western technology, _____ it is leading in many fields, such as the self﹣driving car industry.( )
A./B.orC.butD.and
﹣My grandpa practices playing the guitar______ in the university for the elderly every day.
﹣cool! It's never too old to learn.( )
A.hardB.hardlyC.greatD.greatly
According to a survey, four out of five women do housework at home, but only______of men would do it.( )
A.four fifthB.four fifths
C.two fifthD.two fifths
Boxing Day, the 26th of December, got_____name from a time when many rich families gave boxes of gifts to poor people who had to work at Christmas.( )
A.it'sB.itsC.one'sD.one