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【单选题】
当雌性动物 表现为精神兴奋、食欲减退,接受公畜或其它母畜的爬跨,有很强性欲 时处于发情周期的哪一时期。( ) A、发情前期 B、发情期 C、发情后期 D、间情期A.
B.
C.
D.
D
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举一反三
【单选题】From the passage it can be assumed that wind energy is better because ______.
A.
it is cheaper than electric power
B.
it does not alter the environment as much as other types of power
C.
it lasts longer than electric power
D.
it is more efficient than electric power
【判断题】It is now believed that the comet is produced by the combined action of the solar wind and the inter-planetary magnetic field.
A.
正确
B.
错误
【简答题】Sailing You may think that sailing is a difficult sport, but it is really not hard to learn it. You do not need to be strong. But you need to be quick. And you need to understand a few basic rules abo...
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