What does“a chocolate Lab" in Paragraph 2 refer to?
A、A scientist.
B、A dog.
C、A researcher.
D、A cat.
.I couldn't go to the meeting because I had to()my brother after his accident.
A、take after
B、look after
C、look over
D、take over
4.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.()