单项选择题

A．They change color every 50 minutes.
B．They change color more quickly.
C．They change color more slowly.
D．They change color on the same schedule.
<上一题 目录 下一题>
热门 试题

单项选择题
Cigarettes manufacturers were eager to quit television and radio advertising because the cost of advertising was getting much higher.
A．Y
B．N
C．NG
单项选择题
Since 1939, numerous scientific studies ______.
A．proved smoking causes fatal diseases
B．proved smoking causes life-shorting diseases
C．proved smoking is a health risk
D．had been made to prove whether smoking causes life shorting
相关试题