【文章內(nèi)容簡介】 load, lift and wear themthese allimportant accessories（配件）can be a pain in the back. Not to mention the neck, head and shoulders. Backpacks can influence your health. Carrying a heavy load improperly can lead to poor body position。 and even hurt the spinal column（脊柱）This can cause muscle strain, headaches, back, neck and arm pain. For example, if it is carried on one shoulder。 a heavy backpack forces the muscles and spine to balance the unequal weight. This may increase the possible back problems later in life.More than 50 percent of young people suffer back pain by their teenage years. Research shows that this could be mainly caused （場）improper use of backpacks.Here39。s some advice to help you carry backpacks fortably and safely. Choose the right backpack. Forget leather （皮革）! It looks great, but it39。s far too heavy. Go for canvas（帆布）. Pick a pack that has two wide, adjustable, fortable shoulder straps（帶子）, along with a hip or waist strap, and plenty of pockets. Make sure the pack fits properly and its size is suitable for the wearer39。s body. Packing it properly. Only put in the pack what is needed for that day. It39。s a good idea to know what each object weighs. The total weight of the filled pack should be no more than 10 to 15 percent of the wearer39。s own body weight. Pack heaviest objects close to the body, and place little ones outside, away from the back. Putting the backpack on. Put the pack on a smooth surface, at waist height. Put on the pack, one shoulder at a time, then adjust（調(diào)整）the straps to fit fortably. Remember when lifting a backpack, or anything, to lift using the arms and legs and to bend at the knees. The right way to wear a backpack. Both shoulder straps should be used, and adjusted so that the pack fits the body, without hanging to one side. Backpacks should never be worn over just one shoulder. You should be able to move your hands between the backpack and your back. The waist strap should also be worn. Take the above advice, and you may not plain back pain, numbness or weakness in your arms and legs any more.（1）What could mainly cause some young people to suffer back pain by their teenage years? A.Too much homework.B.Poor treatment for backs.C.Improper use of backpacks.D.Unhealthy sleep position（2）Which of the following does the writer suggest?①Choose leather backpacks because it looks cool to go to school.②Pick a pack that its size is suitable for the wearer39。s body.③Make sure the backpack contains only what is needed for that day④Pack heaviest objects close to the body, and place little ones outside.⑤Put the pack on a smooth surface, above the waist height.A.①②④B.①③⑤C.②③④D.②③⑤（3）If a boy weighs 40kg, how heavy should his filled backpack be at most? A.About 4kg.B.About 6kg.C.About 10kg.D.About 15kg.（4）What is the passage mainly about? A.Some problems that teenagers face in their study at school.B.The suitable backpack material that you should choose.C.The good influence that backpacks have on your healthD.Some advice on how to carry backpacks fortably and safely.【答案】 （1）C（2）C（3）B（4）D 【解析】【分析】短文大意： 短文主要講述背包影響學(xué)生的健康，如何舒服地和安全地使用背包。 （1）細(xì)節(jié)理解題。根據(jù) More than 50 percent of young people suffer back pain by their teenage years. Research shows that this could be mainly caused （場）improper use of backpacks. 可知不正確使用背包可能誰引起背疼。故選C。 （2）細(xì)節(jié)判斷題。根據(jù) Make sure the pack fits properly and its size is suitable for the wearer39。s body. 保證背包的大小與背書包的人相符，即②；Only put in the pack what is needed for that day. 需要的時候才背書包，即 ③ ；Pack heaviest objects close to the body, and place little ones outside, away from the back. 當(dāng)背重物的時候，背包需要貼近身體，背輕的東西時，可以離遠(yuǎn)點(diǎn)，即 ④ ；故選C。 （3）細(xì)節(jié)理解題。根據(jù) The total weight of the filled pack should be no more than 10 to 15 percent of the wearer39。s own body weight. 這個男孩四十公斤，可知他最多背15%40kg=6kg，故選B。 （4）此題考查主旨大意。這篇短文主要對如何正確使用背包使人更舒服更安全給出的幾點(diǎn)建議，故選D。 【點(diǎn)評】此題考查閱讀理解。先閱讀短文，理解短文大意。然后進(jìn)行審題，弄清題意，帶著問題閱讀短文，從短文的細(xì)節(jié)中找出細(xì)節(jié)理解問題的答案。對于主旨大意題要根據(jù)文章的中心思想確定。6．閱讀下列短文，從每題所給的A、B、C三個選項(xiàng)中選出最佳答案。 If you look at the top of your phone, you39。ll usually see a little symbol that says 3G or 4G. The G stands for the generation （代） of your mobile network. But the symbols will bee things of the past after 5G networks fully arrive. On March 30, Shanghai vicemayor Wu Qing made the first 5G video call on a Huawei Mate X Smartphone. Shanghai has also bee the first city in China to start testing 5G networks. About 100 times faster than 4G networks, 5G will let people download and upload data（數(shù)據(jù)） faster than ever before. But 5G won39。t just bring faster mobile internet. People can use it for many other things as well. For example, 5G will help to make selfdriving cars safer. Today39。s selfdriving test cars have one problemlag（延遲）. When the car sees an obstacle（障礙物）, it sends this information to a data center and receives instructions, However, it will be some time before it sends and receives this information. With this kind of lag, the cars might crash because they don39。t receive instructions in time. With 5G, this lag will be greatly lowered, making the cars safer.5G could also be used to power the internet of things （IoT）, that is, a large online network that connects all things and people. Fast internet speeds will be the key to developing this technology. The IoT could be used in a lot of ways. For example, with IoT, your refrigerator could automatically （自動地） place an order online for eggs when it finds that there are no eggs left inside.（1）Which city was 5G tested for the first time? A.Beijing.B.Shanghai.C.Shenzhen.（2）What can we infer（推測） according to the passage?. A.5G is wid