单项选择。
Which do you like, English Chinese? [ ]
A. and
B. or
C. but
D. so
答案：B
Can I have ____ look at the photo of your pen friend?[ ]
A. a
B. an
C. /
D. the
利用绳索下滑训练时，必须控制下滑速度，严禁（）
A.长时间停留
B.急降
C.急停
D.下降过慢
