In May 1989, space shuttle "Atlantis" released in outer space the space probe "Megal-lan",
A. problems of space travel
B. scientific methods in space exploration
C. the importance of Venus to the earth
D. conditions on Venus
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Rogets Thesaurus is a book, and a very famous book, too. If youve never heard of it, dont
A. a book review
B. an advertisement
C. an editorial
D. a special report
北京的地形是_____高，_____低，山地占_____，它的最东端是_____;最西端是_____。
肠套叠
A. 剑突下阵发性钻顶样绞痛
B. 上腹刀割样疼痛，板状腹
C. 右下腹痛，结肠充气试验阳性
D. 小儿腹痛，右下腹触及香肠样肿物
E. 右上腹疼痛，墨菲征阳性
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