Question

一些英语问题（在线等）急！！！谢谢了！

none of their new products have sold well,___?
a.haven't they b.have they
this area is often __as China's Silicon Valley
a.known b.referred to
the American expression"burning your bridges" means acting in ___way that you destroy any chance to turn back or change your action
a.a b.such a
On TV every taxi driver looks as if he had nothing __to drive 90 miles an hour trying to keep up with another car ,often in pouring rain.
a.more to do but b.better to do than
请问这几题为什么选你们认为的那几个答案？
这四题的答案应该是a,b,b,b如果答案一致的话，请告诉我为什么，谢谢！我有很我想法也和已给我回答的朋友一样，但是答案不是你们说的呀！

Answer 1

a(前面none是否定词,所以后面该用肯定)
a(be known as词组)
a
a(在电视里的的士司机好像除了......没什么好做了)

Answer 2

b
a
b
b

Answer 3

B
A
B
A

Answer 4

答案应该是:b,a,b,b 吧,我想你有必要怀疑你的答案的正确性.