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【多选题】
下列化合物含有伯碳原子的是A.
乙烷
B.
正丁烷
C.
丁烷
D.
叔丁烷
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举一反三
【简答题】简述水体中农药的来源。
【单选题】The presence of microorganisms that produce a toxin causes seawater to turn brownish red, a phenomenon known as a red tide. Sea otters do not feed in areas where clams, their main source of food, have...
A.
In some of the areas where red tides occur, neither clams nor sea otters are indigenous species.
B.
The presence of sea otters in a given area has a significant effect on which other marine organisms are to be found in that area.
C.
When seawater in an area unaffected by red tide is artificially dyed brownish red, sea otters do not feed on the clams in that area.
D.
If the clams in a given area are contaminated with toxins, sea otters move to other areas in search of food.
E.
Although very small amounts of the toxin produced during a red tide are not harmful, large doses can be fatal to animals the size of sea otters.
【判断题】Software engineering causes us to produce a lot of useless documents and thus reduce our productivity.
A.
正确
B.
错误
【判断题】Human
beings produce too much carbon dioxide which causes the global warming on the
earth.
A.
正确
B.
错误
【单选题】What does the "Love Drug" reading say causes mammals to produce oxytocin?
A.
being aware of others
B.
giving birth
C.
giving things away
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