According to the passage, we now know ___________ .
A.more and more about food and health
B.food and health
C.how to keep fit and stay healthy
D.health is not important

___________ (55)
A.performs
B.performing
C.perform
D.performed

___________ (51)
A.so
B.but
C.and
D.then

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
A.determine
B.eventually
C.historian
D.threaten

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
A.represented
B.biography
C.indirectly
D.entertainment

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
A.combination
B.understand
C.scientific
D.astronomy

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
A.employer
B.reunite
C.understand
D.recommend

___________ (50)
A.him
B.his
C.her
D.hers

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
A.agricultural
B.international
C.philosophy
D.university

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
A.measurement
B.information
C.economic
D.engineer