【单选题】________advertisements, TV programs are often made boring. [ ]
A.
Regularly interrupted by
B.
Regularly interrupting
C.
To regularly interrupt
D.
To be regularly interrupted by
【简答题】已知 是椭圆 的两个焦点,P为椭圆 上的一点,且 .若 的面积为9,则 .
【简答题】A.Flies need less sleep than humans. B.Humans need a similar amount of sleep with flies. C.The amount of human sleep is determined by certain gene. D.Flies can determine how much sleep they need.
【单选题】已知P是椭圆 上的一点, 是该椭圆的两个焦点,若 的内切圆的半径为 ,则 ( )
【简答题】A.aims B.agrees C.shoots D.flies
【简答题】若P为椭圆 上的一点, 为椭圆的两个焦点,则 的周长为 .
【单选题】Flies evolve to be smarter only in the labs fundamentally because______.
A.
flies can adapt to the environment without learning
B.
the cost of learning in the wild is too huge to bear
C.
they may get some diseases as a byproduct in nature
D.
the lab conditions allow them to learn better
【简答题】设P为椭圆 上的一点, 、 为该椭圆的两个焦点,若 ,则 的面积等于( ) A.3 B. C.2 D.2