题目内容

种群密度也可以看成是种群个体的数目。( )

A. 对
B. 错

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目前许多显示器都采用数字控制,其特征是内置微处理器,显示器的所有工作状态和调节信号均由 【20】 进行处理,比机械调节方式更加方便和准确,还具有即插即用功能。

passage twoQuestions 30 to 32 are based on the passage you have just heard.

A. Kings and queens, princes and princesses, and lords and ladies built castles in order to get more land. .
B. Around the outside of a castle, a moat was dug, which was often filled with water.
C. A castle was built behind a thick end high stonewall, which was strong enough to stand the possible attack of enemies.
D. If a drawbridge was pulled up, there was no way for people to enter the castle.

物质循环又称为生物地球化学循环,是指各种化学物质在生物和______之间的循环运转。

鱼类种群内较小的个体比大的个体更有利于躲避捕食者,那么小的个体就会有更高的存活率并能留下更多的后代,这说明鱼类个体在______上是存在差异的。

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