下列四幅图中能正确表示地球自转方向的是（）
A.A
B.B
C.C
D.D
参考答案：D
当高速公路上车辆发生故障时，人员应当疏散到下图哪个位置。
A、位置AB、位置BC、位置CD、位置D
—Listen! Kathy is playing the piano in the next room.
—It ______ not be Kathy. She called me on the way to the post office just now. [ ]
A. can
B. must
C. need
D. shall
