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【单选题】
Klinefelter综合征最常见的核型是A.
47，XXY
B.
47，XYY
C.
46，XX/47，XY
D.
46，XY/47，XYY
E.
46，XY/47，XXY
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【单选题】— Hurry up!It's already 8:20. — ________ ! It takes only 20 minutes to get to the station and the train doesn't leave until 9:20. [ ]
A.
No hurry
B.
No way
C.
No problem
D.
No chance
【单选题】Every morning Mr. Smith takes a ______ to his office.
A.
20 minutes’ walk
B.
20 minute’s walk
C.
20-minutes walk
D.
20-minute walk
【单选题】It only __________ him 20 minutes __________ to his office every day.
A.
takes; to drive
B.
took; drive
C.
takes; drive D takes took
【单选题】Fifty years ago, most people lived in rural areas. But the world has changed. In the near future, more than half of all people will live in cities for the first time in history. City life is not alway...
A.
urbanization and its effects
B.
a huge effect of human
C.
economic development
D.
the environment
【单选题】Tom______half an hour doing his homework and listening to pop music ______him 20 minutes.
A.
costs; spends
B.
spends; take
C.
takes; costs
D.
spends; takes
【单选题】It takes Mr Wang 20 minutes lunch every day.
A.
、 cook
B.
、 to cook
C.
、 cooking
D.
、 cooks
【单选题】It _______ me 20 minutes _______ to the park.
A.
spends ; to walk
B.
spends ; walking
C.
takes ; to walk
D.
takes ; walking
【单选题】Tom takes 20 minutes to cook an egg and 5 minutes to make a sandwich. Jerry takes 15 minutes to cook an egg and 3 minutes to make a sandwich. Tom has a comparative advantage in ________ and Jerry has ...
A.
cooking eggs; making sandwiches
B.
making sandwiches; cooking eggs
C.
neither of these activities; both activities
D.
both activities; neither of these activities
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