目前市面上的防晒霜大致分为两种:物理性防晒霜和化学性防晒霜。物理性防晒霜中主要含有二氧化钛或者氧化锌,通过反射阳光起到保护皮肤的作用;化学性防晒霜含有人工合成有机物,通过吸收和过滤紫外线来降低对皮肤的伤害。两种防晒霜各有优缺点,分别受到不同肤质人群的喜爱。化学性防晒霜中比较常见的防晒剂有羟苯甲酮、甲氧基肉桂酸辛酯,有研究人员在实验室和数个热带野外地区发现,羟苯甲酮可能威胁到海洋生物,尤其是珊瑚的生存。研究表明,由于游客众多,在一些热门旅游地,每年有大量防晒霜终被冲刷到珊瑚礁中,当一段时间内,某片海城内化学成分产生生物富集作用,珊瑚就会驱逐共生在它们身上的藻类,也就是产生珊瑚的“白化”现象。如果这一现象持续下去,珊瑚可能会死亡。
近年来,我国相关部门实施有效管控,进一步提高了海洋维权巡航执法的时空覆盖率,有方保障了我国海洋国土安全和海上通道安全,我国海洋权益维护和海上安全保障能力进一步加强。在各国海军中,每艘军舰通常以一个海军基地为“母港”,结柬任务后回到这个“家”。与陆军、空军基地相比,各国的海军基地都占地更广,功能更复杂。军舰在这里加油装弹,补充物资,检查修理;海军官兵在这里得到充分休整和训练。为全面過止海洋生态环境恶化趋势,中国海洋管理部门通过健全海域有偿使用制度,创建海洋生态文明示范区,推进“蓝色海湾”“生态岛礁”重大工程建设等措施,加快了构建海洋生态文明新格局的步伐。
又转过一个山包,是一大片连着的庄稼地,现在全荒了。转过得水家,月亮看见祠堂了。守祠堂的孤老头七叔公会点香火。都是岁月,都是故事。前些年,祠堂香火很盛,除了年节、醮会,村里红事、白事都在那里上香鸣炮,禀告先人。祠堂,是一个村的中枢,是圣地哩。月亮想起了官厅前面两块石碑上刻着的字:月出满地水,云来一天山。今天是十四,往年这时候,祠堂已经开始祭祀的一些仪式了,而眼下,祠堂一片虚空,分明是一个孤独的老人,正在月光下品着这无边的寂寞呢。
Electric cars may seem like a recent invention,but they have been around for years. In the early 1900s, there were ___16___electric cars on the road than gasoline(汽油)cars, because at that time,gasoline was expensive compared with other fuels(燃料), electriccars were more popular.
Once, herfather took her to the kitchen. He asked Jane to take a potato, an egg ____11____two spoons of tea leaves. Jane was ____12____, and asked her father, “Doyou want me to cook?”
Tim: _______36_______,Bob.Bob: Good afternoon, Tim. Icalled you just now, but nobody answered. _______37_______?Tim: I went to the cinema.And I watched a movie named The Battle atLake Changjin.Bob: Oh, great. It’s very famous nowadays. _______38_______?
Bike-to-Work Day is held every year across NorthAmerica on the third Friday of May. It was started by the League ofAmerican Bicyclists in 1956. Its aim is to promote (促进) the bicycle as a seriouschoice of getting to and from work. In today’s world where global warming is aserious issue, the bicycle is a perfect way of reducing our carbon (碳) footprint.
My arms were shaking and my heart was beating ____19____when I stood at the starting line. ____20____ the endless runway (跑道), I felt like a boatfighting against the wind and rain.
There was an old oak tree in the garden. Holly’sfather wanted to cut it down and build a new office there. Holly felt sad anddidn’t agree. She moved into the old tree house which was her favourite place in the world.One day, it rained all night.
For a long time, I guarded the garden of peaceand quiet. When the children followed me into the garden, I would expect themto be out of sight (视野). And I would hand out tasks.
The December day started like any other. Papacame back with his boat full of fish. Mama made breakfast for the family.Seven-year-old Joonas was doing his homework, while his two little brothers ranaround the yard.
In ourdaily lives, we are often given some boring or tiring tasks. What’s in yourmind when your mom tells you to clean the floor? Have you ever wanted tocomplain(抱怨)? I think most people have.
The boy named Li Banghua is from Hefei. AnhuiProvince. He made the plane completely by himself. The plane is 0.6 meterswide, has a wingspan (翼展) of 4.4 meters and weighs about 40 kilograms.According to a local report, Li just finished his high-school entrance exam ayear ago and got good grades.
I often use old clothes that people don’t wearany more to make bags. I opened a small shop in my community and set up awebsite to sell the bags online. Many customers think they are fantastic. Now Iplan to write a new book about ways to use old clothes.
Michelle,a famous lady, has found that more than 25% students are too fat in hercountry. It is a very serious problem. So she starts a Health Program to dealwith it. The Health Program is to reduce the number of fat students today andin the future.
Theoil paper umbrella is a traditional Chinese handicraft(手工艺品).It has a history of over 1,000 years in China.In early TangDynasty, it was introduced to Japan and Korea, so it was called the “TangUmbrella”. Later oil paper umbrellas were spread to other Asian countries, suchas Vietnam, Thailand and Laos, and each had its own style. However, assteel-ribbed(钢骨的)umbrellas appeared in the last century, thehand-made oil paper umbrellas became less used in daily life. They were turnedinto decorative artifacts(装饰性工艺品).
___14___, I think an interest in Englishis very important. When I was in Grade Three, we had a new ___15___ — English,it was new for me. I was interested in it. I worked hard at it. Soon we had anEnglish exam and I got a very good mark. How ___16___ I was! After that,I learned English harder. Our English teacher often teaches us English songs,and ___17___ sound nice. I often think how interesting English is!
FIFA World Cup is one of the biggest sportsevents in the world. It ___11___ every 4 years. The first World Cup wasin 1930. It has a history of over 90 years. During the World Cup, ___12___fans watch the games and cheer for their favorite teams or players. We haveknown some famous football players from the football competitions, such asBeckham, Messi, and Figo. They have excited football fans for many years.
The fantasticman-made “forest” is a Singapore landmark. It is made from steel and concrete(水泥) covered in localflowers and plants. At night, 18 solar-powered tree-like towers which get theirenergy from the sun often light up the city.
Studying is not always the most interesting taskwithin your day, but it is a necessary one. Even though it is required,everyone has got bored at one time or another while studying.