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【单选题】
网状结构上行激动系统A.
位于脑于网状结构尾端
B.
与丘脑联络核之间形成反馈联系
C.
脑髓板内核群接替后继续上行
D.
属于特异投射系统的一部分
E.
属于非特异投射系统的一部分
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【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.