[求助]987的几个问题 17.18.23.25

1.       
A patient accusing a doctor of
malpractice will find it difficult to prove damage if there is a lack of
some other doctor to testify about proper medical procedures.

(A) if there is a
lack of some other doctor to testify

(B) unless there
will be another doctor to testify

(C) without
another doctor’s testimony

(D) should there
be no testimony from some other doctor（C）

(E) lacking
another doctor to testify

答案是C 那为什么不能选B呢？

1.       
A peculiar feature of the
embryonic mammalian circulatory system is that in the area of the heart the
cells adhere to one another, beating in unison and adopting specialized
orientations exclusive of one another.

(A) beating in
unison and adopting

(B) they beat in
unison while adopting

(C) beat in
unison, and adopt

(D) beating in
unison yet adopting（D）

(E) even though
they beat in unison and adopt

答案选D  

请问这个句子的结构怎么理解

1.       
A recent New York Times editorial criticized the city’s election board for,
first of all, failing to replace outmoded voting machines prone to breakdowns,
and secondarily, for their failure to investigate allegations of
corruption involving board members.

(A) secondarily,
for their failure to

(B) secondly, for
their failure to

(C) secondly, that
they failed and did not

(D) second, that
they failed to（E）

(E) second, for
failing to

答案是E  那么为什么还要加这个for 之前first of all前不是已经有一个了么 

这样表达使句意更明确么？

        A recent study of ancient clay
deposits has provided new evidence supporting the theory of global forest
fires ignited by a meteorite impact that contributed to the extinction of
the dinosaurs and many other creatures some 65 million years ago.

(A) supporting the
theory of global forest fires ignited by a meteorite impact that

(B) supporting the
theory that global forest fires ignited by a meteorite impact

(C) that supports
the theory of global forest fires that were ignited by a meteorite impact and
that

(D) in support of
the theory that global forest fires were ignited by a meteorite impact and that（B）

(E) of support for
the theory of a meteorite impact that ignited global forest fires and

答案是B  但是完全不理解。。n+of是限定 +that是解释对不对？

还请NN指点！

Q1. testify, 在字典的解释是这样的

to speak seriously about something, especially in a court of law。 所以，明显不能和about一起用。已经包含了about sth的意思

Q2.动名次带的句子修饰 cell,  转折要表达出来

Q3.介词要重复，这样结构看着更平行

Q4.用了of会有歧义哦

解释下
A recent study of ancient clay deposits has provided new evidence supporting the theory of global forest fires ignited by a meteorite impact that contributed to the extinction of the dinosaurs and many other creatures some 65 million years ago.

注意看，我可以理解为theory 被点燃了。。。。