A：﹣4
B：4
C：±4
D：16
幕布的表面是粗糙的，这是利用____让教室内不同位置的学生都可以看见幕布上的影像和文字．晚上要将幕布上的图片用照相机拍下，____（该/不该）开闪光灯．
Our Trip to Yibin City
When
On Friday.
How
We will go there 1.
What
But you will need to bring 2 .
Where
Then in the afternoon we will go to 3.
What time
⑴Now please remember that the bus will leave right at 4 .
⑵Tell your parents we'll be back at school 5.
