167.
M: I thought that computer cost 1,000 dollars.
W: It used to , but the shop owner has lowered the price by 150 dollars.
答案解析：
正確答案為B。根據(jù)I thought that computer cost 1,000 dollars.我以為那臺(tái)電腦要1000美元呢。以及l(fā)owered the price by 150 dollars.降了150美元。可知，現(xiàn)在這臺(tái)電腦的價(jià)格為850美元，因此B項(xiàng)正確。

168.
W: Prof. Wang said that the final exam would cover the first nine units.
M: Really? I thought it only included the first five units. Then I must spend the weekend going over the rest of them.
答案解析：
正確答案為A。根據(jù)final exam would cover the first nine units.期末考試的內(nèi)容包括前九個(gè)單元的內(nèi)容。而男子以為it only included the first five units.只包括前五個(gè)單元，所以周末going over the rest of them.要復(fù)習(xí)剩下的內(nèi)容，即四個(gè)單元，因此A項(xiàng)正確。