Many students ______ chances to show themselves in class because the class size is too big.
A：don't give
B：aren't given
C：haven't given
D：won't give
细菌按形态分类可分为____ 、____ 、____ 等不同形态．
运用遥感技术监测森林火灾与人工监测相比，优点有（ ）
①获取资料快，可及时进行动态分析②受地面限制少，避免人员伤亡③获取信息量大④探测范围大，可在客观上进行监测
元朝漕运、海运的交汇处是（ ）
— It's ____ great pleasure to take part in ______ wonderful party.
— Thank you again for your coming.
