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【简答题】
若两个椭圆的离心率相等，则称它们为“相似椭圆”．如图，在直角坐标系 xOy 中，已知椭圆 C 1 ： ＝1， A 1 ， A 2 分别为椭圆 C 1 的左、右顶点．椭圆 C 2 以线段 A 1 A 2 为短轴且与椭圆 C 1 为“相似椭圆”． (1)求椭圆 C 2 的方程； (2)设 P 为椭圆 C 2 上异于 A 1 ， A 2 的任意一点，过 P 作 PQ ⊥ x 轴，垂足为 Q ，线段 PQ 交椭圆 C 1 于点 H .求证： H 为△ PA 1 A 2 的垂心．(垂心为三角形三条高的交点)
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举一反三
【单选题】夏季园林绿地的相对温度较非绿地的高 ____________ 。
A.
、 5 ％—— 10 ％
B.
、 10 ％—— 15 ％
C.
、 10 ％—— 20 ％
D.
、 20 ％—— 30 ％
【单选题】It can be inferred from the passage that the sin tax is______.
A.
a tax levied to curb unhealthy consumption
B.
the most important source of revenue of British government
C.
a tax levied on the basis of personal income
D.
a tax borne by enterprises rather than consumers
【单选题】When a tax is levied on a good, the buyers and sellers of the good share the burden,
A.
provided the tax is levied on the sellers.
B.
provided the tax is levied on the buyers.
C.
provided a portion of the tax is levied on the buyers, with the remaining portion levied on the sellers.
D.
regardless of how the tax is levied.
【单选题】Which act levied taxes on wines, silks, coffee and other items?
A.
Sugar Act
B.
Stamp Act
C.
Intolerable Act
D.
Tea Act
【单选题】Which of the following is not included in the Stamp Act to tax on?
A.
diamond
B.
newspaper
C.
legal document
D.
marriage certificate
【单选题】Which act levied taxes on newspapers, pamphelets and other documents?
A.
Sugar Act
B.
Stamp Act
C.
Intolerable Act
D.
Tea Act
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