林植的栽种方式有单纯密林、混交密林和（）。
A、特殊密林
B、乔木密林
C、灌木密林
D、疏林
参考答案：D
I was talking with my monitor when a fight ________between the students of the two classes.[ ]
A. blocked out
B. hung out
C. watched out
D. broke out
