对混凝土或浆砌石护坡分段时，即每隔一定长度预留一道（）。
A.表面缝
B.临时缝
C.龟纹缝
D.永久缝
参考答案：D
She is short. So she sits ______ the classroom. [ ]
A. in the front of
B. in front of
C. at the back of
D. next to
The people there are _______. So they often talk _______. [ ]
A. friend, happy
B. friendly; happily
C. friend; happily
