按照对消费者的影响程度分类，相关群体可分为（）。
A．示范群体
B．基本群体
C．次要群体
D．其他群体（渴望群体）
E．比较群体
参考答案：B, C, D
根据句意，用括号中所给单词的适当形式填空。
1. The victim's __________ (arrive) made all of us very excited.
2. It's _________ (polite) to laugh at others.
3. He never told truth before. He was a __________ (honest) boy.
4. Male wolves __________ (protect) their families if there is danger.
5. We shouldn't buy clothes __________ (make) of animal fur.
6. They __________ (plan) a trip to Beijing from 6 to 8 yesterday evening.
7. The girl will try her best __________ (learn) English well.
筛漏斗的内界为（）
A.筛泡
B.钩突
C.上颌窦开口
D.额隐窝
E.额骨鼻突
