The pending G20 summit will focus on issues including climate change，steel and migration.

对

错

对

错

ATo seek business opportunities in China.

BTo build up cooperation with Chinese enterprises.

CTo enhance communication in the area of technology.

DAll of the above.

ARoad construction.

BTunnel construction.

CAircraft manufacturing.

DHigh-speed rail construction.

AA free trade agreement was signed between Australia and China.

BImport tariffs were removed on Australian minerals.

CChina imported far less coal from Australia.

DAustralian coal export to China was only 17 percent of that of February in 2014.

AIt creates special stereoscopic displays or screens.

BIt uses pixels to cover the real world, so it is not transparent.

CIt makes simulations in a fixed setting in games.

DIt has real/virtual world graphics overlaying each other.

ANearsightedness has become the most common visual problem in children.

BAbout 600 million people have the problem of nearsightedness.

CAbout half of the world population are suffering nearsightedness.

DOver 70 percent of high school and college students are nearsighted.

ATheir adverse effects weigh more than positive ones.

BThey are changing the unfair tax system of the UK.

CAll of them are paying tax to the UK to run their business in the country.

DCurrent regulations have lagged behind the evolution of these businesses.

AThe only procedure they have to go through is to scan the QR code at the entrance.

BThey don’t have to queue up to pay for their goods because there are convenient machines for checkout.

CThey don’t have to go through the checkout and instead they can scan the QR code on the goods for payment.

DThere are no checkout stations in the stores so customers cannot get a receipt for what they buy.

AHow data deluge can affect people’s life.

BHow to disconnect with the world in the era of data deluge.

CWhat is digital detox and why people are doing it.

DWhat digital detox can do to people’s life.