15. A.
either B.
whether C.
what
D. how
名师点评
本文主要想告诉读者，学英语是一个长期而艰苦的劳动，没有任何捷径可走。无论你用什么方法学习--用书、机器或在学校，不多实践就无法达到预期的目的。
答案简析
B。这里的or是“否则”的意思。
C。根据作者的观点，这种事绝对不可能发生。impossible是一个形容词，不符语法，can’t后不可能跟happens，often意思与作者的意图相反。
D。唯一容易学的语言是母语。这里需要一个形容词充当后置定语。
A。用来修饰不可数名词，只有用how much，全句意为“母语好学，还需要那么多的练习。”何况外语呢？。
B。动词不定式充当目的状语。意为“学习外语来研究文学”。
C。说某种语言用speak，speak English，speak Chinese。
D。用it代指上文所说的a foreign
language。
B。这里的with是“用”的意思。
A。作者在这里提出一种假设。如果他们一星期只有一两次使用外语。
C。固定短语，意为“做某事花费某人多长时间”。
B。后面省略了than 6 hours。意为6个小时或更多的时间。
D。it 代指上文所指的foreign language，故用被动被态。
C。许多人不可能做到这一点。这里不可以用not possible，因为它的主语不可以用人。
D。机器和书对于学习英语来说是很有帮助的。
B。whether …or…固定短语。
Martin Henfield talks about some of his
experience(经历) as a twin: when we
were small my mother dressed us __1_ the same clothes. That was bad
enough and we didn’t like it. But we went on our first camping trip, it was
even __2__. We were only ten years old, and while __3_ went into their
sleeping bags for the _4__, we were not happy to snuggle(偎依) inside a double sleeping bag my mother made for us.
At school our classmates __5__us Henfield
One and Henfield Two, so people ___6__ even see our difference according to our
initials because __7__ of us were M.O. It was only when I went to
_8___ and began to have my own friends that I started to feel my own freedom of
identity(身份).
Before I went to college, during my
secondary school __9__, I __10__ to a job on a building site. My twin brother,
Mike Henfield, didn’t work. One day I asked my boss, “Can I have a week
_11__?” “Certainly,” he said, “but you won’t have the job when
you 12__ back.” I didn’t want to __13__ the job. So on Monday
morning, Mike went there in my _14__, jacket and hat and he
worked for me for one week __15___ of them knew the difference.