隋唐时期的科举制度，是通过分科考试选拔官员的，常设的科目主要有____________ 科和___________ 科。
明经；进士
句型转换。
1.We can visit the Palace Museum next Sunday. (就画线部分提问)
________ ________ you________ next Sunday?
2. Joe has to clean his room every morning. (变为否定句)
Joe________ ________ to clean his room every morning.
3. Let the dog come in. (变为否定祈使句)
________ ________ the dog come in.
4. He was late for school, because he got up late. (就画线部分提问)
________ ________ he late for school?
大中桥石料冻融循环次数为( )次。
A．15
B．20
C．25
D．50
