题目内容

The study also a direct link between obesity and mortality.

A. demonstrate
B. demonstrates
C. had demonstrated
D. demonstrated

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When China and the United States their diplomatic engagement in the 1970s, Richard Nixon, Henry Kissinger, had to practice eating with chopsticks.

A. begin
B. are beginning
C. had begun
D. began

While chopsticks actually really commonplace in American society today, there was definitely a time in the late 1800s when the idea that Asian men were of a different quality than American men .

A. were, exists
B. are, exists
C. are, existed
D. were, existed

How many kilo calories are there in a gram of carbohydrate?

A. 4
B. 5
C. 6
D. 9

According to the food and nutrition board, carbohydrates should provide ( )of total calories in the diet.

A. 20-30%
B. 30-40%
C. 40-50%
D. 45-65%