题型:问答题 简答题 H+浓度相同的等体积的两份溶液A和B,A为盐酸,B为醋酸,分别和锌反应,若最后仅有一份溶液中存在锌,且放出氢气的质量相同,则下列说法正确的是①反应所需要的时间B>A,②开始反应时的速率A>B,③参加反应的锌的物质的量A=B,④反应过程的平均速率 B>A ⑤盐酸里有锌剩余 ⑥醋酸里有锌剩余A.③④⑥B.②③⑥C.③④⑤D.①②⑤ 查看答案
题型:问答题 简答题 任务型阅读。请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。注意:每个空格只填1个单词。 Adventure Travel Why do people travel? Well, many people travel because they want to see other countriesand visit places that are famous, interesting or beautiful. People also travel to meet new friends, to try new kinds of food, to experience life in other parts of the world or simplyto get away from cold weather. Yet there are other reasons why people travel. Many of today's travelers are looking for an unusual experience and adventure travel is becoming more and more popular. Here is a quick look at two popular activities: hiking and rafting. HIKING Instead of spending your vacation on a bus, in a hotel or sitting on the beach, you maywant to try hiking. Hiking is a great way to travel. You will get close to nature and takeexercise at the same time. Hiking is easy to do and doesn't have to be very expensive. Youcan hike close to home or travel to other places. The basic equipment you need for hiking is simple: good shoes, clothes and backpack. You can hike in the mountains, in a forest oralong a river. You can also go for a hike in the city. Hiking is fun and exciting, but you shouldn't forget safety. Here are some basic tips for successful hiking: ★ Hike with your friends. ★ Tell someone where you are going. ★ Bring water and good map. ★ Watch out for dangers, such as spiders, snakes or poisonous plants. ★ Wear a hat to protect yourself from the sun. ★ Bring a cell phone if you have one. Rafting Another exciting adventure is rafting. A raft is a small boat that you can use to paddle (划桨) down rivers and streams. Rafting is a good way to experience nature. If you want a normal rafting trip, choose a quiet stream or river that is wide and has few fallentrees or rocks. If you are looking for more excitement, you may want to try white-water rafting. White-water rafting is more adventurous and difficult than normal rafting. It is done on rivers and streams where the water moves quickly. You have to be careful not to hit rocks, trees and other dangers. The name "white-water" comes from the fact the water in these rivers and streams looks white when it moves quickly. As with hiking, you should always think about your safety and wear good clothes. You also need to learn the basic skills of rafting, such as how to get in and out of the raft.You should not go rafting unless you know how to swim, and you should always wear a life jacket. People travel for various 1._____Hiking Rafting 2. _____Close to nature Take exercise. Easy and 5. ______ Advantage 8. ______ natureThings 3. _______Good shoes, clothes and a backpackSomething needed Life 9. ______ 4. _____ tipsDon't hike 6. ______.Tell someone where you are going. Look out 7. ______ dangers. Wear a hat to protect yourself from the sun. Bring a cell phone.Rafting skills How to 10. ______ the raft 查看答案
题型:问答题 简答题 根据下面的情境,展开想象,写一段一百字左右的文字。 你驾驶着一艘宇宙飞船,在茫茫的太空中寻找外星生命。你离开地球已经好几天了。这时,透过弦窗,你看到一个美丽的蔚蓝色星球……_____________________________________________________ 查看答案