已知x2-mxy+y2是完全平方式,则m=( )。
±2
按要求填空。
A.按括号内的要求写出单词。
1.will not(缩写) 2.right(同音词)
3.potato(复数) 4.save(反义词)
5.take(过去式)
B.根据句意,写出所给单词的正确形式,每空只填一词。
1. Li Ming jumps the (high) in our class.
2. He felt (happy) during his holiday.
3. The people around (we) are very friendly.
4. It's very easy for (play) to get hurt.
5. It was (sun) yesterday. So there was no (rain) in the sky.
C.根据句意,用所给动词的适当形式填空。
1. You should (be) careful.
2. They (fly) to Shanghai yesterday.
3. It's time for us (have) a rest.
4. — paper (make) from wood? —Yes.
5. The girl (ride) the bike is in Class One. We (call) her Mary.
社会主义市场经济倡导正当竞争,反对不正当竞争。下列企业行为中属于不正当竞争的是()。
①甲企业为了扩大销售,加大广告宣传力度,影响消费者购买行为
②乙企业为了扩大市场份额,进行有奖销售,最高奖励现金1万元
③丙企业通过捐建希望小学,提高了知名度,扩大了市场份额
④丁企业为了稳定市场份额,联合行业内的其他企业达成价格协议
A.①②
B.②③
C.②④
D.③④