图是北半球某地二分、二至日太阳高度日变化。读图回答13～16题。

小题1:该地的经度是                                                 (      )

A．15°E

B．30°E

C．15°W

D．30°W小题2:某日该地日出时北京时间为11：00，则该日该地日落时北京时间为      (      )

A．01：00

B．03：00

C．21：00

D．23：00小题3:若黄赤交角为K，则图中h_l与h₂的差为　                           (      )

A．1/2X

B．X

C．3/2X

D．2X小题4:一年中该地正午物体影子朝北的时间约为                          (      )

A．3个月

B．4个月

C．8个月

D．9个月

The survivors of the crashed plane had no food or water and were ________ the extreme cold weather.[ ]

A. in the possession of  

B. in the charge of

C. at the mercy of  

D. at the risk of