Today, much of the world’s ocean is still a mystery. Only 5 percent of it 【小题1】 (explore) so far. In fact, we know more about some areas of Mars 【小题2】 some parts of the world’s ocean.

New technology, however, is helping scientists explore these 【小题3】 (hide) worlds. For example, scientists are using 【小题4】 underwater vehicle called DeepSea to explore seamounts-underwater mountains.

Scientists have used DeepSea to study Las Gemelas, an area of seamounts near Costa Rica. A huge 【小题5】 (vary) of species live around Las Gemelas. Some of these species may have chemicals 【小题6】 can help people fight illnesses.

The 【小题7】 (deep) location of the earth is the Mariana Trench in the Pacific Ocean. The ocean floor there is 【小题8】 (approximate) 11,000 meters deep. In 2012, filmmaker and explorer James Cameron reached the Mariana Trench in a vehicle called DeepSea Challenger. He was the first 【小题9】 (complete) the journey alone. Cameron took photos and made videos on the ocean floor. Deep sea exploration also helps us 【小题10】 other ways. For example, we are learning how underwater earthquakes cause tsunamis. As Cameron says, “This is the beginning of opening up a new frontier.”

How would feel if moving to a new town meant 【小题1】 (lose) track of your friends? What if the only way of getting news from faraway friends was writing letters that took 【小题2】 (age) to be delivered? Thanks to advances in technology, how we make friends and communicate with them has changed 【小题3】 (significant).

The digital age 【小题4】 (enable) us to find people who share our interests. Such as collecting model cars or playing an unusual instrument. Whatever our hobbies, the Internet can connect us with others 【小题5】 also enjoy doing them even if they live on 【小题6】 other side of the world. On social media sites, people tend 【小题7】 (post) only positive up dales that make them appear happy and 【小题8】 (friend). But smiling photos can hide real problems. Remember the saying：on the Internet. Nobody knows you’re a dog. A young person could be old; a woman could be a man; we could even be sharing our information 【小题9】 criminals.

But this doesn't mean that we should throw the baby out with the bathwater. Although technology has changed the way we acquire (获得) friends, the 【小题10】 (mean) of friendship and our longing for friends remain the same. As Aristotle said, no one would choose to live without friends, even if he had all other goods.

The Chief Executive Officer of Beijing Aiqi Technology Yang Zhang has revived the Chinese cultural practice of using the mortise and tenon (榫卯) technique for construction which is on the edge of extinction.

He used the ancient mortise and tenon technique 【小题1】 (construct) the Turret of Palace Museum at a 1:81 mini-scale. The choice of “Turret of Palace Museum” 【小题2】 the theme for the mini building block project 【小题3】 (base) on several factors.

【小题4】 (locate) in the Forbidden City of Beijing, this architectural treasure boasts the 【小题5】(delicate) design and elegant shape among Chinese royal buildings. It was historically responsible for protecting the palace. The complex layout of the turret posed 【小题6】 unprecedented (史无前例的) technical challenge for Zhang and his team of designers and 【小题7】(develop). Unlike conventional building block toys, Zhang aimed to create a model made 【小题8】 (complete) of authentic mortise and tenon components. The entire process of design took nearly five years, with hundreds of design iterations and continuous adjustments.

The mortise and tenon technique, 【小题9】 is the primary construction method used in ancient Chinese architecture and represents the core of traditional Chinese woodworking, is gaining 【小题10】(increase) recognition among the public.