Scientists chose twins for their study because ______.




A.they have the same genetic background, usually with similar intelligence
B.they are born into the same family, hence the same upbringing
C.they have the same economic background and hence the same opportunities
D.each twin has the same environment as his/ her twin

_________(42)




A.of
B.with
C.for
D.about

The building work must be finished by the end of the month _______ of cost.




A.ignorant
B.regardless
C.thoughtless
D.uncaring

_______ students in our class is 45.




A.A large amount of
B.A lot of
C.A number of
D.The number of

It couldn’t have been Mary that you heard shouting last night , as she is vacationing in Vermont at the moment




A.right now, Mary is having a holiday in Vermont , so it is impossible that it was she whose shouting you heard last night.
B.I think that Mary is on holiday in Vermont now , so you may be wrong in thinking that you heard her yelling last night
C.if it was Mary that you heard yelling last night , then she can’t be taking a vacation in Vermont at the moment
D.are you sure is was Mary who shouted to you last night , because , as far I know , she is on vacation in Vermont at the moment

-“ where can we meet ? ”




A.-“ where can we meet ? ”
B.I do not know
C.I do not want to meet you
D.It’s up to you

at present, the rate of economic growth is very satisfactory , but _____ when foreign competition makes itself felt , this will not be the case.




A.effectively
B.eventually
C.enthusiastically
D.considerably

According to the passage , 84 million gallons of oil can travel through the pipeline each___.




A.month
B.day
C.week
D.year

the word “ undertaken” in line 17 is closest in meaning to __________.




A.transported
B.removed
C.selected
D.attempted

The word “it ” in line 1 refers to__________




A.ocean
B.state
C.village
D.pipeline