下列词语中的划线字，注音全都正确的一组是( )
A：混沌(dùn) 洗漱(sù) 食不果腹(ɡuǒ) 察言观色(chá)
B：模样(mú) 庇佑(pì) 无耻谰言(lán) 返璞归真(pú)
C：纰缪(miù) 对称(chèn) 桀骜不驯(jié) 涣然冰释(huàn)
D：华裔(yì) 模拟(nǐ) 戮力同心(chuō) 力挽狂澜(lán)
钛酸亚铁（FeTiO3）可用来冶炼金属钛（未来将替代钢铁），其中钛元素的化合价是（ ）
据报道，某市开展了为期一个月的飞机播种造林工作，用马尾松种子飞播后，采用阔叶树种(木荷、枫香、台湾相思树等)人工点播或补植，以形成针叶阔叶混交林。这样做对于保护生态平衡的作用是( )
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中单词的正确形式填空 Do you know how to be a top student? Top students are decided by a new way now. New rules for middle school students ____ (come) out in March. The best students should not only have good grades. You'll be a top student ____ you follow the new rules.____ (one), you need to be honest. You should never copy others’ homework. Second, good students love animals and care____ other people. They try to do something to protect animals, too. Are you one of them? Third, you should learn that teamwork____ important. So be friendly to the people you are with and it can make your team stronger.
