地球自转产生的地理现象是[ ]
A．四季的变化
B．昼夜长短的变化
C．太阳直射点的变化
D．昼夜交替
答案：D
David jumped_ _ _in the long jump. He won the game! [ ]
A. longest
B. farthest
C. fastest
D. highest
The plan __________just because people were unwilling to cooperate (合作).
A．broke down
B．pulled down
C．turned down
D．put
