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计算和化简
⑴${\left(ab\right)}^5·{\left(ab\right)}^2$
⑵${\left(x^2·x^m\right)}^3÷x^{2m}$
⑶$a^2·a^4+{\left(-a^2\right)}^3$ 
⑷$3^0-2^{-3}+{\left(-3\right)}^2-{\left(\frac{1}{4}\right)}^{-1}$
⑸${\left(x-y\right)}^3÷{\left(y-x\right)}^2$
⑹${\left(n-m\right)}^3·{\left(m-n\right)}^2-{\left(m-n\right)}^5$

《刑法修正案（九）》将校车严重超员超速、违法运输危化品等行为列入刑事处罚范围，从犯罪的最本质的特征来看，这些行为都具有（    ）

若$x,y\in R$且满足$x+3y=2$，则$3^x+{27}^y+1$的最小值是（    ）

阅读下面短文，从每小题 A、B、C、D 四个选项中，选出能回答所提问题或完成所给句子的最佳答案。

A

    Summervacation is coming. Do you want to enjoy some films? Here are four great onesto be on show.

New Times Movie Theatre

Where are we going, Dad?

Time: 9:00 am – 11:30 am Saturday

Price: ￥15 (free for kids under 7)

    The film is about a forest trip by several fathers with their sons. During this trip they meet lots of dangers and challenges…

Ant-Man

Time: 2:00 pm – 4:00 pm Saturday

Price: ￥20 (free for kids under 7)

    This is a science fiction film(科幻片) about a super hero named Lang. He had to keep a magic suit from falling into the hands of bad men. Wearing the suit, Lang can become as smart as an ant and has all abilities…

Finding Dory

Time: 9:00 am – 11:00 am Sunday

Price: ￥30 free for kids under 7)

    Finding Dory is a cartoon film about an unforgettable journey of fish under the sea…

The Martian

Time: 3:00 pm – 5:00 pm Sunday

Price: ￥35 (free for kids under 7)

This is a science fiction film about an astronaut who succeeds in living on the Mar…