A. Features and applications
B. Display and data connection
C. Online stores
D. Differences from iPhone
E. Business usage
F. Operating system
Paragraph 4 ______

A. Water is forced into sand by the high pressure under a crest.
B. Strong whirlpools loosen the sand.
C. The sand is first at the bottom when a crest passes.
D. More sand is pushed back to the sea.

A. There are more enzymes in decal drinkers’ urine sample.
B. There are more melatonin concentrations in caffeine drinkers’ urine sample.
C. Decaf drinkers produce less melatonin.
D. Caffeine drinkers produce less sleep hormone.