Liquid semiconductor is used to______.
A. get rid of the radioactive waste
B. test the power of nuclear batteries
C. decrease the size of nuclear batteries
D. reduce the damage to lattice structure
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What does the underlined' word "collapsed" probably mean?
A. Were destroyed.
B. Caught fire.
C. Were flooded.
D. Sank.
According to Jae Kwon, his nuclear battery______.
A. uses a solid semiconductor
B. will soon replace the present ones
C. could be extremely thin
D. has passed the final test
What is the best title of this passage?
A. The Lantern Festival
B. The ingredients of Yuanxiao
C. The difference between Yuanxiao and Tangyuan
D. China' s traditional food--Yuanxiao
Which country does the Lantern Festival come from?
A. China.
B. South Korea.
C. Jin Dynasty.
D. Tang and Song periods.