A. wings are shaped smoothly这一点很奇怪，机翼光滑的形状？明显不符合逻辑。按照逻辑，应该是光滑的机翼和其完美的形状使流经机翼的空气变得不turbulent。A错误。
B. smooth 和 perfectly shaped 都修饰wings，B正确。
C. smooth（可能为副词）和perfect应为副词
D. 错误同A。
E. 错误同A。
in C, there is a real consideration for Veterinarians —— potentially direct competition from stores, and the other goods they are selling don't have this kind of problem. This option directly points to a plausible reason, while A gives an ambiguous argument
along，介词，沿着，如：walked along the road；副词，向前，如：get along with sb，drove along驱车前行，come along一起来。
along with=with，
a whole new class of dominant large mammals，of表同位关系，大型哺乳动物的统治阶层；如果是the domination of large mammals，则of表动作的对象，对大型哺乳动物的统治
错选E
E选项中“the last day that they are scheduled to collect”，that指代day，句子变成了collect the day，是错误指代
D中the last scheduled day避免了E中的“that”限制性修饰，说明了就是计划的最后一天，但不确定是具体哪一天
READ THE SENTENCE LITERALLY.
Choice c only gives a condition followed by IF, but no more information is provided to show whether the IF conditions would be the real case, i.e. the regulation is fully enforced, so it is of little help to the argument
E，a law passed in 1933, making sth a crime ，这里making更有可能会指向1993而不是law，定语的跳跃修饰似乎不能跳过谓语动词，如：
W：A law was passed in 1993, which make sth a crime, 这里which不能跳过passed做定语修饰law
R：A law in 1993 making sth a crime was passed,making可以跳过介宾修饰law。
从句和to do的区别：to do代表状态的转换，相对于从句的谓语动词，to do表示动作尚未发生，如：
She has lots of homework to do tonight.(作业还没做）
Have you got something to eat?（这些东西还没被吃掉）
A，The law makes that a United States citizen hold gold a crime
D, The law makes to hold gold for a United States citizen a crime，for sb引入to do的发起者
携带黄金既然已经是违法行为，可以预见人们并不会去做这件事情，所以用to do比用一般现在时的从句好。
A. nor 用于否定句之后引出另一个否定句需要用倒装语序，即nor were they even very curious，此外be preoccupied with和be curious about 为固定搭配。
C. be preoccupied with, be curious about，因此应改为neither preoccupied with, nor even very curious about, the reasons that led to their parents divorce
D. neither ... nor ...，而且them指代不明，reasons or parents' divorces?
E. it 错误
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A. wings are shaped smoothly这一点很奇怪，机翼光滑的形状？明显不符合逻辑。按照逻辑，应该是光滑的机翼和其完美的形状使流经机翼的空气变得不turbulent。A错误。
B. smooth 和 perfectly shaped 都修饰wings，B正确。
C. smooth（可能为副词）和perfect应为副词
D. 错误同A。
E. 错误同A。