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Sweet potatoes that could save lives.The lack (of vitamin A can cause blindness and many other illnesses.Insub-Saharan Africa,plant experts are helping them grow a kind of new sweet potatoes.These potatoes can help them fight against some illnesses.39.The folding bike helmet isA.made from metalB.thick and heavyC.as strong as a traditional one40.Now.the dream of shoes that can tie themselves comes true inA.ChinaB.JapanC.America41.The smart alarm clock can NOTA.improve our sleepB.control our weightC.control the temperature in the bedroom42.If a child has a poor eyesight,he may be in the lack ofA.vitamin AB.vitamin BC.vitamin C43.You can find the passage in aA.story bookB.magazineC.guide book(c)请阅读下面语篇，从每小题所给的A、B、C三个选项中，选出一个最佳选项，并在答题卡上将该项涂黑。Many people love travelling to different countries,but if you plan to go abroad,you should know how tobehave in different situations around the world.Most travelers enjoy meeting new people,but sometimes you can be rude without saying anything.In Russia,you should never shake hands in a doorway,and if you're travelling in Thailand,never touch people's heads orpoint your feet at people.In most countries in Europe people expect a lot of eye contact when you talk to them,but in many Asiancountries a lot of eye contact seems unfriendly.And in South America people usually stand quite close to each otherwhen they talk,but in countries like the USA you need to give people more personal space.Also,it's rude tointerrupt Japanese people while they are talking to you.You must wait until they finish before you start speaking.When you're travelling in Asia,if someone invites you to his or her home,don't forget to take off your shoeswhen you arrive.And if you visit an Arab family's home,don't admire anything valuable because your host willfeel he should give it to you as a present.With so much to think about,it's not surprising that many people prefer going on holiday in their owncountries-or you might just decide to stay at home!44.Which of the following statements is TRUE?A.We can admire anything valuable in an Arab family's home.