求助0308的几道语法题，谢谢！

uspresidentUID: 2123602

11．        In jazz music, a riff is a simple melodic figure, _________ and repeated several times.
(A)        usually one or two measures lasted
(B)        lasted one measure or two usually
(C)        is lasting one or two measures usually       
(D)        usually lasting one or two measures
为什么选D呢？不是说and前后形式要一致吗？谢谢！
21.Tarantulas inject a paralyzing venom into prey or with their large fangs
为什么选C呢？怎么改呢？
31.Some ways in which lizards different from snake are in having ear openings, moveable eyelids, and less flexible jaws.
different要改成difference?为什么阿？谢谢！

mwhUID: 201249

11题前面有讨论，你可以找一下
21，改为with/by，反正or多余
31，是改为differ。定语从句还原lizards differ from snakes in some ways， 用different就导致定语从句没有动词谓语

[ Last edited by mwh on 2005-12-27 at 13:56 ]

uspresidentUID: 2123602

好的，谢谢！