The pyramids were built by piling one stone block upon _____.

Problems were ________at work. A: getting up B: piling up C: taking up

The basic producing process of dark tea is：（ ）. A: fixation B: initial kneading C: piling D: rekneading E: drying

Every semester after final exams are over， I'm faced with the problem of what to do with books of lecture notes。 They might be useful someday， but they just keep piling up on my bookcase。 Based on the context， what is the given information？（ ）。 A: lecture notes B: They, they C: production D: capacity

Every semester after final exams are over, I'm faced with the problem of what to do with books of lecture notes. They might be useful someday, but they just keep piling up on my bookcase. Based on the context, what is the given information, A, B, C, or D?（ ）。 A: They, they B: lecture notes C: bookcase D: books

Choose the correct letter, A, B, C or D.Write the correct letter in boxes 22-26 on your answer sheet. What is the final effect of the katabatic winds A: Increasing the moving speed of ocean current B: Increasing the salt level near ocean surface C: Bringing fresh ice into the oceans D: Piling up the mountainous ice cap respected by mariners