脚手架是建筑工程中的（）。
A.永久安全保护设施
B.工人临时操作面
C.材料临时堆放点
D.临时的运输通道
参考答案：B, C, D
Read and judge. (读短文，判断对“T“F")
Look! Mike is in a yellow T-shirt. Tom is in a blue jacket. Mary is in a beautiful white dress.
Alice is in a black sweater.
( )1. Mike has a gray T-shirt.
( )2. Tom wears a blue jacket.
( )3. Mary doesn't have a white dress.
( )4. Alice is in a blue sweater.
A milestone is a significant（）in a project.
A.activity
B.event
C.phase
D.process
