英语作业，请高手帮忙解答下21. As she matured as an artist, she （ ） realiz

英语作业，请高手帮忙解答下
21. As she matured as an artist, she （ ） realize that
"all artists are a product of their culture."
A. came to
B. kept to
C. took to
D. went to
满分：2 分
22. NASA's Mars program was set back when two
spacecraft failed up reaching Mars, one （ ）up in the planet's atmosphere and the
other after a software failure.
A. burned;
disappeared
B. burned;
disappearing
C. burning;
disappearing
D. burning;
disappeared
满分：2 分
23. He （ ）the problem （ ）in his mind for a whole week
before he did anything about it.
A. switched...on
B. kicked...up
C. turned...over
D. took...on
满分：2 分
24. "Hi, John, could you show me how to （ ） graphics
with text on the same screen?"
A. fuse
B. clone
C. merge
D. mingle
满分：2 分
25. My trip to the small village under the control of
the enemy fire was full of delays and difficulties, but I eventually （ ） .
A. got by
B. turned it over
C. hit the sack
D. made it
满分：2 分
26. The ( ) of older persons is relatively low in
developing countries, but it is growing much faster than in the West.
A. addition
B. majority
C. percentage
D. statistic
满分：2 分
27. When energy is converted from one form to another,
some energy is always lost as heat.（ ）,no energy conversion is 100% efficient.
A. In other terms
B. In other words
C. In another way
D. In some way
满分：2 分
28. In social dancing, the participants dance for their
own pleasure rather than for the ( ) of an audience.
A. appreciation
B. entertainment
C. leisure
D. temptation
满分：2 分