下列调查中适合作抽样调查的有
①了解一批炮弹的命中精度;②调查全国中学生的上网情况;③审查某文章中的错别字;④考查某种农作物的长势。[ ]
A.1个
B.2个
C.3个
D.4个
答案:C
—My teachers often encourage me ________ more friends but I find it difficult.
—Your teachers’ idea is right. The more friends you make, ________ you will be.
A.to make; the more happy
B.to make; happier
C.making; the happier
D.to make; the happier
规划的站点中最好有()以上的站使用客户提供的站点。
A.70%
B.80%
C.85%
D.90%