Question

________ is now no ________ that global warming is a security threat to us all.

1. A.
   There; doubt
2. B.
   There; need
3. C.
   It; doubt
4. D.
   It; need

Answer 1

A
题意：毋庸置疑，全球变暖对我们所有人的安全来说是一个威胁。There is no doubt that..."……是毫无疑问的"，为固定搭配，符合题意。There is no need that..."……是没有必要的"。