—May I speak to the headmaster? —He a meeting now. Can I take a message?
A：is having
B：had
C：has
D：will have
—Sorry, I ________, I have no key to the door.
能证明淀粉部分水解成葡萄糖的试剂是（ ）
被鲁迅称之为“史家之绝唱，无韵之离骚”的我国第一部纪传体通史著作是（ ）
温度/℃
20
40
60
80
溶解度/g
1.68
3.73
7.3
13.4
— .
