13.已知点A(2,3),C(0,1),且,则点B的坐标为
.
12.展开式中
的系数为
.
11.椭圆的离心率为 ,其焦点到相应准线的距离为
.
35. At the United Nations Climate Change Conference, the UN Secretary General points out that, ______, the climate situation will get worse and worse.
A. if not dealing with properly B. unless dealing with properly
C. if properly dealt with D. unless properly dealt with
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