【单选题】The underlined phrase 'cyclists' failure to keep up with the desired speed of motor traffic' in the second paragraph means______.
A.
cyclists' speed is beyond the limit
B.
cyclists' speed is much lower than that of motorists' and they easily get hurt
C.
cyclists often compete with motorists on the roads
D.
motorists usually took down upon cyclists.
【单选题】According to the passage, driving can be safe if
B.
you obey all the traffic rules
C.
you don't cut another car off
D.
you wait in line at a red light
【单选题】What can be a possible result of sleepiness?
A.
Industrial development will be slow.
C.
People will get fired from work.
【判断题】目前 染色体核型分析 作为优生优育的筛查项目已经普及,所有人在孕前准备时都必须做该项检查。
【判断题】R=U/I中的R是元件参数,它的值是由电压和电流的大小决定的。 ( )
【单选题】Red sectors of navigation lights warn mariners of ______.
B.
heavily trafficked areas
C.
recently sunken vessels
【单选题】When hearing a distress call, all station shall immediately cease any transmission capable of _with the distress traffi