According to the passage, which of the following reached the moo first?
A、A pair of tortoises.
B、American astronauts.
C、Russian astronauts.
D、Dogs and monkeys.
24.( )
A、firm
B、positive
C、definite
D、absolute
5. Directions:In each of the following groups of words, there are four underlined letters or lettercombinations marked A, B, C and D. Compare the underlined parts and identify theone that is different from the others in pronunciation. Mark your answer by blackeningthe corresponding letter on the Answer Sheet.()