All the dishes in the menu, ________ otherwise stated, will serve two or three people.
A. as
B. if
C. though
D. unless
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He found it increasingly difficult to read, ________ his eyesight was beginning to fail.
A. though
B. for
C. but
D. so
I haven't seen Ann for ________ long that I've forgotten what she looks like.
A. such
B. very
C. so
D. too
He tried his best to solve the problem, ________ difficult it was.
A. however
B. no matter
C. whatever
D. although
位错属于哪一种缺陷
A. 肖特基缺陷
B. 弗伦克尔缺陷
C. 线缺陷
D. 面缺陷
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