In zoolology class the birds you see in this slide are peregrine falcons these birds represent a successful story amang the animals on the endanger species list in 1970 the peregrine almost disappear as a result of contaminantion of food chain by ddt in pesticide the presence of the poison in their system resuled in eggs too weak to support the xxxx, the remarkable recovery is reault of the ban of ddt as a pesticide aggressive captive feeding program and their own resiliency peregrine falcon is one of fastest birds alive they can cross at 12 per hours in successful pursuit of pray in addition these birds fly directly into head wind and they are capable of flying more than 600 miles per day with favorable tail wind
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5 c& O' |, F; L4 n4 e8 kHi janet you are so lucky to done with all of your final exams and term paper I have two more final to take * \9 {! E6 E1 q' ^6 e
Really yeah so what do you think are you doing in this summer anything special oh actually yes you know places with historical significance I guess they wanted to reinforce the stuff we learn in school about history and eben though we are older now they still do once in a while o so where will you go this summer finally you have’t been there yet I mean Gettysburg it famous civil world site in the country it is only a couple of hours away you think that would be the first places they have taken you
4 [5 @3 t, [5 y! `& ~6 L0 u: p. p9 ~怎么感觉比场景 难很多