Who ____ a red pen? [ ]
A. has
B. have
C. is there
答案:A
Would you like a sandwich?[ ]
A. Yes, I do.
B. Yes, please.
C. Yes, I am.
岩层在空间的位置是由( )确定的。
A.(A) 地壳运动
B.(B) 走向和倾斜
C.(C) 地形地貌
D.(D) 走向、倾向和倾角