题目内容
Joule carried out a series of simple e________ to test his theory.
A variety of butterflies ________ flying in the jungle, one of which is a very rare one.
A. is B. have been C. are D. has been
困在暴风雨中几天了，它们不得不以树叶为食。(be caught in)
If you happen to __________ my lost novel while you are searching for you book, please let me know at once by telephone.A. come out B. come up C. come across D. come about
He has kept a teaspoon as a ________ (纪念品) of his journey.
China achieved brilliant a________ achievements in the 2004 Athens Olympic Games.
Britain_________________(议定) a trade agreement with China.
