Second, we make a [very] (conservative) assumption that we are looking for a life form (that is [pretty well] like us), [since if it differs radically from us] we may [well] not recognize it as a life form, quite apart from whether we’re able to communicate with it.The two clauses(分句) introduced by“that” are( )clause and ( ) clause respectively.
A. The first is attributive(定语) clause; the second is appositive(同位语)clause.
B. The first is appositive(同位语) clause; the second is attributive(定语)clause.
C. Both are appositive(同位语) clauses.
D. Both are attributive(定语) clauses.