2017年我国在国际上首次实现了非人灵长类动物的体细胞克隆，世界上第一、二个体细胞  ▲  “中中”“华华”在中国科学院神经科学研究所诞生。（    ）

美国学者德里克认为，1927年统一战线内部因党际与党内的分野而爆发了革命策略冲突。这一冲突首先表现为(　　)

要使 $\frac{a}{8}$ 是假分数， $\frac{a}{9}$ 是真分数，a应是(   )。

①2H₂（g）+O₂（g）═2H₂O（l）△H₁=﹣571.6kJ•mol^﹣1②CH₄（g）+ $\frac{1}{2}$ O₂（g）═CO（g）+2H₂（g）△H₂=﹣36kJ•mol^﹣1③CH₄（g）+H₂O（g）═CO（g）+3H₂（g）△H₃=+216kJ•mol写出甲烷不完全燃烧生成一氧化碳和液态水的热化学方程式：____．现有1mol由H₂O（g）与O₂组成的混合气体，且O₂的体积分数为x，将此混合气体与足量CH₄充分反应，当x=____时，反应②与③放出（或吸收）的热量相等．

根据短文内容，选择正确答案。

    Canberra is the capital of Australia. It is a modern and lively city with a population of over 345, 000.

History

    Canberra is the eighth largest city in Australia. It is 238 kilometres from Sydney and 507 kilometres from Melbourne. Melbourne was once the capital of Australia. Sydney people also wished to make their city the capital. It was difficult for the government to make the decision. Then in 1911, the government chose a place to build the new capital. It was between Sydney and Melbourne, the two largest cities in Australia. It took more than 14 years to build the city. In 1927, the city was set up. It became the capital and was named Canberra. "Canberra" means "a place for friends to get together".

Culture

    Canberra is a beautiful city with trees and flowers everywhere. There's the Flower Festival in September each year. People can enjoy all kinds of beautiful flowers and welcome the spring to arrive. A manmade lake—Lake Bertey Griffin is in the center of the city. It's about 25 kilometres long. People like to ride bikes, walk or run around the lake. In Canberra, there're many famous universities like the Australian National University and the University of Canberra. The National Library and the National Museum of Australia are also famous places that people like to visit.