大哥大姐们 帮忙看两个选项1马上考试了

pipilovelail

以前还真没注意过 can和be able to do 这么细过，谢谢！恩，时态还真没注意，光想那些相对性错误了。把最直接的绝对性错误忽略了。

pipilovelail

103.    (29869-!-item-!-188;#058&004446)

The parachutelike membranes of Africa's scaly-tailed flying squirrels differ from those of the flying squirrels in the family Sciuridae because they are attached to a cartilage rod at the elbow instead of the wrist.

(A) because they are attached to a cartilage rod at the elbow instead of
(B) because of being attached to a cartilage rod at the elbow rather than at
(C) in their attachment to a cartilage rod at the elbow instead of being attached at
(D) in that they are attached to a cartilage rod at the elbow rather than at
(E) in their being attached to a cartilage rod at the elbow instead of
又错了。。。虽然是因为马虎没有看到A没有at，但是我想问的是 这里用的in that而没有用because是因为，原文想从parachutelike membranes不同的角度来解释这两种松鼠的不同是吗？如果A加上at没有了比较歧义，也不对是吗？

二丫丫

used after a statement to begin to explain in what way it is true 。也就是说它是来解释某一情况为什么是真实的，可以理解为“表现在”。I've been lucky in that I have never had to worry about money.而because更多的是强调一种因果关系。而in that则不一定。换到上面的例子里来说，也就是说，如果用in that的话，是我很幸运，因为我从来不用为钱担心。不用为钱担心解释了lucky这件事情。而如果用because的话，则成了因果关系，即不用为钱担心导致我很幸运，这显然在逻辑上是行不通的~
对照此题来讲，这里显然更强调的是一种因果关系，是single tree可以produce巴拉巴拉造成了前半句所说的那种情况。如果用in that的话，就成了咖啡的年产量变化很大，表现在……。这跟用because表达的完全是两个意思。

zjnyforever

我觉得最大的错误是could吧 为啥要用could呢？