辨认主题句:
Choose the best topic sentence from the four options below.
A
Course grades based on final tests don't accurately measure a student's knowledge of the subject.
B
The service line is frequently so long that a student gives up the idea of eating altogether.
C
On the road, a drunk driver is too dizzy to pay attention to traffic signs, and his lack of control may lead him to run a stop sign, exceed the speed limit, or swerve his car.
D
We are awakened by electric alarm clocks and music pouring from our radio; we operate our toaster, brush our teeth with an electric toothbrush, and shave with an electric razor.
