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【判断题】
动物机体内有一个神经内分泌调节中枢,位于下丘脑,它接受大脑高级中枢的控制后影响该部位促性腺激素释放激素的分泌活动,促性腺激素释放激素可调节腺垂体分泌促性腺激素,促性腺激素作用于性腺后,产生性腺激素,这些性腺激素除了直接作用于生殖道和附性腺以外,还可以反馈作用于下丘脑和垂体部位,控制这些部位以上两类激素的分泌活动。这个上下相互影响、制约来控制各部位激素的分泌量,以便达到调控整个生殖活动的调控系统称为下丘脑-垂体-性腺轴系。A.
正确
B.
错误
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举一反三
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A.
to invent
B.
to have been invented
C.
to have invented
D.
having been invented
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【单选题】The monument was built in honor of the explorer who was believed _____ the river.
A.
to have discovered
B.
to have been discovered
C.
to discover
D.
having been discovered
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A.
to have discovered
B.
to have been discovered
C.
to discover
D.
having been discovered
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