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【单选题】
已知等比数列{a n }的公比为2, 它的前4是1, 则它的前8为 ( )A.
15
B.
17
C.
19
D.
21
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举一反三
【单选题】How long have they been waiting?
A.
Not long.
B.
For more than haft an hour.
C.
For a few minutes.
D.
Several hours.
【单选题】American colleges and universities failed to graduate haft of their four-year degree candidates because ______.
A.
most of them lack high-quality faculties
B.
students are becoming more and more lazy
C.
there are not enough incentives for students to study hard
D.
they attach greater importance to research and publication than to teaching
【单选题】According to the research by Vicki Baker,
A.
more than haft of colleges award bachelors degrees in liberal-arts disciplines
B.
the number of liberal-arts disciplines decreased from 212 in 1990 to 130 last year
C.
colleges have decreased the proportion of bachelors degrees in liberal-a~ disciplines
D.
colleges have decreased the number of liberal-arts courses by more than half
【单选题】It takes a while, as you walk around the streets of Nantes, a city of haft a million people on the banks of the Loire River, to realize just what it is that is odd. Then you get it: there are empty pa...
A.
Nantes is with the best traffic condition in France.
B.
Nantes used to be crowded with cars.
C.
The government of Nantes is the first to dissuade people from driving into town.
D.
The government of Nantes succeeds in raising people's living standard.
【单选题】The course normally attracts 20 students per year, ______ up to haft will be from orient.
A.
in which
B.
for whom
C.
with which
D.
of whom
【单选题】A Canadian researcher has discovered that sound travels 【21】______ air more than one-haft kilometer an hour slower than had been believed. The discovery has surprised many engineers and scientists who...
A.
through
B.
on
C.
to
D.
pass
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