用方解石(no=1.6584,ne=1.4864)做成的四分之一波片(λ=5.893X10-7m)的最小厚度是多少?
A. must
B. needn’t
C. has
D. haven’t
The "new set of wheels" that bicycle riders had to get used to was ______.
A. the new tires on their bikes
B. the automobile
C. the streetcar
D. the bicycle itself
The main idea of the passage is______.
A.how to find important news stories
B.how to read newspapers
C.how to tell apart different news sections
D.how to read stories and editorials
"None of them need do any work today, ______ they?" "Yes, all of them ______.
A.needn't; need
B.mustn't; must
C.need; needn't
D.need; must
Judging from the description, we can tell that this passage must be taken from_____.
A.a newspaper
B.a magazine
C.the Internet
D.a guidebook
What can we learn from the passage?
A.Don't judge a person only by his behavior.
B.People need understanding.
C.Conditions can change a man.
D.Anyone has his strongpoints (优点) and shortcomings.