[单项选择]

Do you wake up every day feeling too tired, or even upset If so, then a new alarm clock could bejust for you.
The clock, called Sleep Smart, measures your sleep cycle, and waits for you to be in your lightest phase of sleep (51) rousing you. Its makers say that should (52) you wake up feeling refreshed every morning.
As you sleep you pass (53) a sequence of sleep states - light sleep, deep sleep and REM (rapid eye movement)sleep - that (54) approximately every 90 minutes. The point in that cycle at which you wake can (55) how you feel later, and may even have a greater impact than how much or little you have slept. Being roused during a light phase means you are more likely to wake up energetic.
Sleep Smart (56) the distinct pattern of brain waves (57) during each phase of sleep, via a headband equipped (58) electrodes (电极) and a microprocessor. This measures the electrical activity of
A. by
B. of
C. with
D. over

[填空题] Do you wake up every day feeling too tired, or even upset If so, then a new alarm clock could be just for you. The clock, called SleepSmart, measures your sleep cycle, and waits (67) _______ you to be in your lightest phase of sleep (68) _______ rousing you. Its makers say that should (69) _______ you wake up feeling refreshed every morning.. As you sleep you pass (70) _______ a sequence of sleep states — light sleep, deep sleep and REM (rapid eye movement) sleep — that (71) _______ approximately every 90 minutes. The point in that cycle at which you wake can (72) _______ how you feel later, and may (73) _______ have a greater impact than how much or little you have slept. Being roused during a light phase (74) _______ you are more likely to wake up energetic. SleepSmart (75) _______ the distinct pattern of brain waves (76) _______ during each phase of sleep, via a headband equipped (77) _______ electrodes (电极) and a microprocessor. This measures the electrical act
A. A．where
B．this
C．which
D．that