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【多选题】
山东蓝宝石呈深蓝色颜色的原因有：（）A.
Fe/Ti比值高
B.
Fe的含量高
C.
存在Fe2＋离子
D.
Mg的含量高
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【单选题】What do we learn about the medical community?
A.
They now have a strong interest in research on aging.
B.
They differ from the academic circles in their view on aging.
C.
They can contribute to people's health only to a limited extent.
D.
They have ways to intervene in people's aging process.
【简答题】相对湿度φ值可以反映湿空气吸收水汽能力的大小，当φ值大时，表示该湿空气的吸收水汽的能力______；当φ=0时，表示该空气为______。
【单选题】What do the researchers mention the 2008 financial crisis for?
A.
To show that being optimistic also has its bad effect.
B.
To explain why people are trying to win lotteries.
C.
To prove a person's feeling is affected by environment.
D.
To point out human beings are social creatures.
【单选题】What do foreigners tend to do in the regression stage of culture shock?
A.
To enjoy the delicious new food.
B.
To complain about their home country.
C.
To make friends with the local people.
D.
To watch videos from their home country.
【单选题】What position do conservationists take?
A.
The tuna industry cannot survive.
B.
Porpoises could survive if fishermen were cautious.
C.
Marine mammals cannot swim very deep.
D.
Fishermen should look for tuna where there are no porpoises.
【单选题】● (74) functions with two layers of protocols．It can connect networks of different speeds and can be adapted to an environment as it expands． (74)
A.
The hub
B.
The bridge
C.
The router
D.
The proxy
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