Why do salmon appear at the base of the Bonneville Dam？
A. Because they are bred there.
Because they need swim upstream to multiply.
C. Because they were brought there by flood.
D. Because people farm salmon in this river for its delicious taste.
胆脂瘤型中耳炎可发生鼓膜____或____穿孔，脓臭，并带有____。乳突X片可显示鼓隐窝、____和____有边缘整齐的圆形透光区。
【B10】
A. friendly
B. talkative
C. easy-going
D. passionate
The word "hazing"(Para. 6)probably means______.
A. shooting them with rubber bullets
B. driving them away
C. gathering and catching them
D. threatening them away
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