具有竖直塔身的全回转臂式起重机，指的是（）。
A．汽车起重机
B．履带起重机
C．轮胎起重机
D．塔式起重机
参考答案：D
按照要求完成下列句子。
1. Mike has some books. (改为否定句)
Mike _______ six books.
2. My pen friend lives in England. (对画线部分提问)
_______ your pen friend _______?
3. Helen is my friend. Amy is my friend, too. (合并为一句)
Helen and Amy _______ my _______.
4. My pen is seventeen yuan. (对画线部分提问)
_______ your pen?
5. It's five thirty now. (写出同义句)
It's _______ now.
