When was the world’s 7 billionth baby born
A. Just after midnoon on Saturday.
B. Just after midnight on Saturday.
C. Just before midnoon on Sunday.
D. Just before midnight on Sunday.
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How does the new vaccine work
A. By activating an immune response.
By selecting one or two genes.
C. By awaking the entire parasite.
D. By deactivating the entire parasite.
According to this news item, experts are concerned about the following aspects EXCEPT ______.
A. population growth.
B. food resources.
C. water pollution.
D. water resources.
运用马克思主义政治经济学中关于价值创造和价值分配的理论，分析我国现行阶段的分配制度。
The person who can go on the flight quickest is someone with ______.
A. ticket and carry-ons
B. ticket and baggage to check
C. printing boarding pass and carry-ons
D. printing boarding pass and baggage to check
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