Before the invention of refrigeration, the______of fish and meat was a problem.
A. keeping
B. preservation
C. maintenance
D. protection
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Don't stay______too late, or you'll be sleepy in class tomorrow.
A. on
B. out
C. up
D. for
I hope you are not______that I obtained this money dishonestly.
A. implying
B. concerning
C. involving
D. conveying
American university students are usually under pressure because their academic performance
A. 美国大学生通常压力较大。因为他们的学业成绩将会影响到未来的事业。
B. 大学里的美国学生通常压力较大，因为他们在学术上的表现对未来的事业会有影响。
C. 大学里的美国学生通常都会因为其学术表现影响到了未来的事业而倍感压力。
D. 美国大学生通常课业负担较重，因为他们的学业成绩对未来的职业生涯会有影响。
The temperature of a gas ______ .
A. changes with the width of a hole
B. sometimes depends on how close together its molecules are
C. has something to do with the molecules that makes it up
D. is always connected with the speed at which its molecules go
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