【推荐1】Scientists are seeking new and creative ways to deal with climate change. As well as reducing our carbon dioxide sent into the air, scientists say we must remove the gas from the air to keep Earths temperature down.

One expert has now suggested pouring carbon dioxide into deep trenches (海沟), forming vast liquid lakes, Steve Goldthorpe, an energy analyst based in New Zealand, says the lakes could forever hold vast quantities of carbon dioxide. This is because once the gas reaches a depth of 3,000 meters it is denser (密度大) than water, meaning it naturally sinks to the seafloor.

“If liquid CO₂ were to be placed in such a trench, it would be 7 per cent more dense than seawater and could remain forever as a lake of liquid CO₂ on the ocean floor,” Mr Goldthorpe wrote in his paper, “the stored carbon dioxide could become solid over time, which would stop it mixing with ocean currents.”

Previously, experts have suggested burying the extra carbon dioxide deep underground, possibly in abandoned (废弃的) oil and gas fields. While first tests have shown that this method has potential, scientists are still unsure whether people would accept the fix.

Carbon dioxide lakes do form naturally in the cold, high-pressure depths of the ocean, but they are rare.

Researchers have previously given up the idea of ocean CO₂ storage because it can make the water more acidic, which may affect ocean ecosystems. Mr Goldthorpe recognizes this in his paper, writing, “Any influence on deep ocean ecosystems would need to be examined.”

1. What is Goldthorpe’s way of fighting climate change?

A．To cut down carbon dioxide sent into air.

B．To make the most of the traditional ways.

C．To pour carbon dioxide deep into the ocean.

D．To dig a large lake for storing carbon dioxide.

2. According to Goldthorpe, CO₂ could remain in the trench on condition that ________.

A．the trench has to be deep enough

B．CO2 must first be changed into solid

C．the trench has to be large enough

D．CO2 must first be taken to the seafloor

3. The previous idea of ocean CO₂ storage has been given up because ________.

A．natural storing places rarely exist

B．many oil and gas fields will have to be abandoned

C．scientists are unsure whether people would accept the fix

D．there are concerns on possible damage to the ocean ecosystem

4. The last paragraph indicates that Goldthorpe’s attitude towards his project is _________.

A．doubtful	B．cautious
C．disapproving	D．determined

【推荐3】Engineers have put a huge garbage collector to gather plastic material in the Pacific Ocean between California and Hawaii, the world's largest spread of garbage, twice the size of the state of Texas.

The Ocean Cleanup organization created the collector. The group's founder, Boyan Slat, an inventor born in 1994, was just 16 when he was moved to clean up the oceans when he was on a dive and saw more plastic bags than fish

Last Saturday, a ship pulling the pipe-shaped floating barrier left San Francisco. Attached to it is a screening skirt that hangs three meters down in the water. The screen is designed to collect the plastic as it moves through the water. Sea animals can safely swim under the barrier

The cleanup system also comes with lights powered by the sun, cameras, and other special devices, so the system can communicate its position at all times. That way a support ship can find it every few months to remove the plastic that has been collected.

Shipping containers will hold all the plastic gathered , including bottles and fishing equipment and are expected to be back on land within a year. Then the plastic will be recycled. The free-floating barriers are made to survive extreme weather conditions and damage from continual use. They will stay in the water for twenty years , thus collecting 90% ofthe garbage in the area.

The Ocean Cleanup has received $ 35 million in donations to pay for the project, hoping to put 60 free-floating barriers in the Pacific Ocean by 2020. "It's important to turn off the taps on plastic entering the ocean, but I also think people can do more than one thing at a time to deal with this problem," Slat said.

1. What drove Slat to invent the collector?

A．The interest in invention.

B．His failure to dive due to rubbish.

C．The sight of too many plastic bags.

D．His knowledge ofgarbage in the Pacific Ocean.

2. How does the floating barrier work?

A．It reaches into the water to collect the plastic.

B．It has large containers to produce power.

C．It forms barriers to protect sea animals.

D．A ship drags it along in the ocean.

3. Which does the underlined word "it" in paragraph 4 refer to?

A．The support ship.

B．The floating barrier.

C．The plastic to be recycled.

D．The position of special devices.

4. What is important for protecting the ocean according to Slat?

A．Sending more collectors into the ocean.

B．Inventing more ocean cleanup devices.

C．Stopping plastic from entering the ocean.

D．Banning the use ofplastic bags in boats.