三、克漏字測驗【請依照段落上下文意，選出最適當的答案 ，選出最適當的答案】
There is one cool feature of the Apple Watch: it can monitor your heart rate. The watch monitors your heart rate
throughout the day, and 16 it available via Heart Rate Glance on the watch. The watch keeps track of your heart rate
continuously while you’re doing a workout with it. Apple is able to monitor your heart rate through a process called
photoplethysmography, 17 uses light in an interesting way to determine your heart rate. Specifically, 18 your
blood is red, it reflects red light and absorbs green light. To measure you heart rate, Apple Watch uses green LEDs along with
light-sensitive photodiodes to determine how much blood happens to be flowing 19 your wrist at a particular time. As
your heart beats, more light is absorbed; between heart beats, 20 light is absorbed. Apple Watch is flashing LEDs on
your wrist hundreds of times per second, allowing it to get a pretty accurate idea of what your heart rate is at a given time. 【題組】20.
(A)few
(B)greener
(C)less
(D)redder
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