单项选择题

A．They can be built to be very light.
B．They are inexpensive to operate.
C．They can be directed by remote control.
D．They easily connect distant points.
<上一题 目录 下一题>
热门 试题

单项选择题
A．Why fog freezes at low temperatures.B．How very small droplets can form.C．Why the density of fog varies.D．How water droplets stay suspended in air.
A．Why fog freezes at low temperatures.
B．How very small droplets can form.
C．Why the density of fog varies.
D．How water droplets stay suspended in air.
单项选择题
A．As a French translator while stationed in Paris.B．While serving in the army.C．As a dramatist in the American theater.D．His college lif
A．As a French translator while stationed in Paris.
B．While serving in the army.
C．As a dramatist in the American theater.
D．His college lif
相关试题