1 . When Earth was just a tiny young thing，it birthed many new continents - then it swallowed them all up, leaving just a few traces behind, a new study shows.
These first continents had a special skill for living fast and dying young, but in doing so, they paved the way for solid continents that eventually led to the emergence of plate tectonics（版块运动）， the new study suggests.
For hundreds of millions of years, the current continents have been more or less stable. But very little is known about the continents that existed early on in Earth's history.
To learn more about that early history, the researchers used computers to model the interactions of rock and magma（岩浆） in the Earth’s crust（地壳） and below. The modeling showed that the earliest continents, known as the Hadean (4.6 to 4.0 billion years ago), were weak and likely to destruction. Modern continents have a comprehensive high tensile strength, meaning it’s hard to tear them apart by stretching.
By the time the Archean (4.0 billion to 2.5 billion years ago) began ending the Hadean, the crust which had first formed was almost entirely replaced by the seeds of the modern continents.
In a sense, the researchers found, those lost Hadean continents made the later, more stable continents possible.
The emergence of continents at the close of the Hadean also contributed fertilizer that would later help seed life on Earth, the researchers wrote. Bits of them broke off and entered the atmosphere and oceans, providing necessary nutrients for the life forms that soon emerged.
1. Compared with the modern continents, the Hadean was________.| A．younger | B．firmer | C．weaker | D．bigger |
| A．It existed 4.0 million years ago. | B．It disappeared before the Archean began. |
| C．It helped make more stable continents. | D．It provided all the necessary nutrients. |
| A．By listing researchers’ findings. | B．By giving a lot of examples. |
| C．By making comparisons. | D．By listing a lot of numbers. |
| A．A science fiction. | B．A science magazine. |
| C．A travel brochure. | D．An encyclopedia. |
2 . Best Diabetes Diets
U.S. News has ranked four leading diets based on input from a panel of health experts. Browse our diet profiles by narrowing down your results until you find the ones that are right for you.
The Flexitarian Diet in Best Diabetes Diets The Flexitarian Diet, which emphasizes fruits, veggies, whole grains and plant-based protein, is a smart and healthy choice. One panelist noted that this diet is “a nice approach that could work for the whole family.” READ MORE → | OVERALL SCORE 4.1/5 WEIGHT LOSS 3.6/5 HEALTHY 4.7/5 |
Mediterranean Diet in Best Diabetes Diets With its emphasis on fruits, vegetables, olive oil, fish and other healthy fare, the Mediterranean diet is extremely sensible. READ MORE → | OVERALL SCORE 4.2/5 WEIGHT LOSS 3/5 HEALTHY 4.8/5 |
DASH Diet in Best Diabetes Diets DASH fights high blood pressure and was praised for its nutritional completeness, safety, ability to prevent or control diabetes, and role in supporting heart health. READ MORE → | OVERALL SCORE 4.1/5 WEIGHT LOSS 3.2/5 HEALTHY 4.8/5 |
Mayo Clinic Diet in Best Diabetes Diets The Mayo Clinic Diet aims to make healthy eating a lifelong habit, and earned praise for its nutrition and safety. READ MORE → | OVERALL SCORE 3. 8/5 WEIGHT LOSS 3. 3/5 HEALTHY 4. 4/5 |
1. If you got diabetes and wanted to lose weight, which food would meet your needs?
| A．Mayo Clinic Diet | B．Dash Diet |
| C．Mediterranean Diet | D．The Flexitarian Diet |
| A．Novel | B．Magazine | C．Website | D．Newspaper |
| A．Dash Diet can benefit your heart health. |
| B．All diabetic diets can fight high blood pressure. |
| C．All the diabetic diets emphasize their complete nutrition. |
| D．The Mayo Clinic Diet has developed a lifelong healthy eating habit. |
3 . On your journey, there are some healthy active transport options, for example cycling.
Active transport benefits
* It’s a convenient and practical way to incorporate (并入) regular exercise into your day.
* Cycling to your stop or station helps to reduce your carbon footprint.
* The cost of buying and maintaining a bicycle is around 1% of the cost of buying and maintaining a car.
* It provides an opportunity to socialize with people in your local community.
* Cycling provides commuters (通勤者) with economical and efficient access to public transport services. On average, 10 times more households are within cycling distance of public transport than they are within walking distance.
Taking your bike on the train
You can take your bike on the train on weekdays, except during the following peak times:
* 7 a.m.-9:30 a.m. towards the CBD (Central Business District);
* 3 p.m.-6:30 p. m. outwards from the CBD;
* at any time during weekends and public holidays.
Note: You can travel in the opposite direction during the specified peak times above.
To avoid travelling during peak times, you must complete your morning journey by 7 a.m. towards the CBD and afternoon journey by 3 p.m. outwards from the CBD.
During peak hours, bikes cannot be brought through Fortitude Valley, Central or Roma Street stations. If you travel with a bike during peak times, you may be asked to leave the train until peak time ends.
Bike storage facilities
Bike facilities offer greater flexibility as you can cycle to a station and securely park your bike before continuing your journey on public transport. Queensland Rail and the City of Gold Coast also offer a number of bicycle storage facilities across our network. You can book a bike locker by emailing us at bikelockerqueries@ translink. com. au.
1. What is mentioned about cycling in the text?| A．It is environmentally-friendly. | B．It is convenient to get around. |
| C．It is helpful to reduce your weight. | D．It is much faster than walking. |
| A．7 a.m. on Christmas. | B．3 p.m. towards CBD. |
| C．6 p.m. during weekends. | D．4 p.m. outwards from CBD. |
| A．A guide book. | B．A health journal. |
| C．A sports magazine. | D．A Travel website. |
