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【简答题】
根据下列条件,求抛物线的标准方程. (1)顶点在原点,焦点在x轴的正半轴上,且距为5; (2)顶点在原点,焦点F(0,-2); (3)顶点在原点,对称轴为y轴,且经过点(2,4); (4)准线方程为
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举一反三
【单选题】Ken Sato is Japanese. He's from ______. He can speak ________ and English.
A.
Japan/ the United States
B.
the United State / Japan
C.
Japan/ Japanese
D.
Japan/Japan
【单选题】听力原文：(Man) Where should I send the revised version of the contract? (Woman) (A) He's probably from the United States. (B) I think my home address would be best. (C) Yes, the last page has five mistake...
A.
B.
【单选题】—Jim is ________ American boy, right? —Yes. He's from ________ United States.
A.
a; the
B.
an; the
C.
a; a
D.
an; a
【单选题】He's from the United States.He's____________.
A.
English
B.
American
C.
Spanish
D.
French
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