44.What do Americans feel about using credit cards nowadays according to the passage?
A、They consider it valuable.
B、They regard it as a shame.
C、They think it dangerous.
D、They find it quite convenient.
Directions:In each of the following groups of words,there are four underlined letters or letter combinations marked A,B,C and D.Compare the underlined parts and iden-tdtify the one that is different from the others in pronunciation.Mark your answer by blackening the corresponding letter on the Answer Sheet.
A、combination
B、climbing
C、bamboo
D、ambition
20.In October 2007,the Chang'e-l satellite was successfully __at Xichang.