unit 7 teenagers should be allowed to choose their own clothes.
section a
1. no way! i don’t think sixteen-year-olds should be allowed to drive.
i’m worried about their safety.绝对不行！ 我认为不应该允许16岁的青少年开车。
我担心你的安全。
解析1】allow 动词，“允许；准许”，常用于下列结构中：
1).allow sb. to do sth，允许某人做某事。
→the teacher allowed him __go )into the classroom.老师允许他进入教室。
2). allow doing sth允许做某事。 →we don't allowsmoke) in public. 我们不允许在公共场合吸烟。
3).be allowed to do sth.被允许做某事。
→passengers are not allowedsmoke) on the train. 乘客不被允许吸烟。
解析2】be worried about为。担心”，与worry about 同义。
mothers are always worried about their children. =mothers alwaystheir children.
解析3】safety 不可数名词，意为“安全；安全性”，其反义词是danger。 adj. →safe --dangerous
1. for your own splease do not smoke inside the plane.为了你自身的安全，请不要在飞机上吸烟。
) kind of food___cool, clean and dry according to the instruction.
a. should be carried b. must be put c. should be placed d. must be kept
2. students must not be allowed to h**e part-time jobs.
part-time 形容词，“兼职的”，其反义词是 full-time，“全职的”，
h**e part-time jobs 做兼职工作。
3. anna wants to get her ears pierced.
解析】get their ears pierced “扎耳洞” “get+宾语+过去分词”结构意为“让……被……”其中过去分词和宾语之间这被动关系，该动作由他人（非主语本身）来完成，含有“被动意义且强调动作已经完成”的意思。get可用h**e替换。如：
1). i got my car r我让人修理了我的车。
2).when are you going to你打算什么时候去理发？
拓展] get sb to do sth 意为 “让某人做某事”，相当于h**e sb do sth，前者不定式须带to，后者不定式不带to。不定式作宾语补足语，与宾语具有主动关系，表示宾语要做的事。
例句】the soldiers got the boy to stand with his back to his father. 士兵们让这男孩背对父亲站着。
the soldiers had the boystand) with his back to his father.
）—did you h**e anyonethe trees? —yes, i had the trees
a. to water; water b. to water; watered c. water; to be watered d. water; watered
4. he should stop wearing that silly earring.他应该不戴那个愚蠢的耳环。
解析】stop doing sth. 表示的是 “停止做（正在做的）某事”，这里的doing sth.为动名词短语，所表示的行为发生在stop 之前，作stop 的宾语。
备课例句】 she stopped crying andlisten) to the music. 她停止哭泣，听起**来。
class begins! stop playing basketball, please. 开始上课了，请停止打篮球。
【拓展】stop to do sth. 表示的是“停下来（原来做的事）去做（另外的）某事”，这里的to do sth.是不定式短语，所表示的行为发生在stop 之后，作stop 的目的状语。
例句】they walked for a while and stoppedh**e) a rest. 他们走了一会儿，便停下来休息一下。
when she came in, we stoppedtalk) with her. 她进来时，我们停下来和她交谈。
) dad, why should i stopcomputer games?
for your health, my boy, i’m afraid you
a. to play; must b. playing; h**e to c. to play; can d. playing; may
5. i agree. they aren’t serious enough.
[解析] aren’t serious enough 不够认真，不够稳重。
enough adj. 足够的； 充足的； 大量的。 置于形容词或副词之后， 用在名词的之前或之后皆可以。
1). my younger brother is now old enoughtake) care of himself.
2).you should workcare) enough while you are working on this problem or you may make a mistake.
( )don’t worry about your baby, my mom is sure to look after itwhile you are away.
a. careful enough b. enough caurful c. carefully enough d. enough carefully
6. i don’t think sixteen-year-olds should be allowed to drive.
【解析】sixteen-year-olds 十六岁的孩子们。
sxteen-year-old adj. 十六岁的。
sixteen years old 十六岁大。
7. i’m really excited about seeing the famous paintings by picasso.
解析】 excite，excited，exciting 意思及用法的区别：
excite 动词，意为“（使）兴奋；激发；唤起”，其形容词为excited和exciting。
excited 形容词，表示“兴奋的”，指人、物对。感到兴奋，是（主动地感到）兴奋的
exciting 形容词，表示“令人兴奋的；使人激动的”，指人、事、物本身让人兴奋、激动
试比较： are youexcite）aboutgo) to beijing? 你要去北京了，感到兴奋吗？
he told us anexcite) story yesterday. 他昨天给我们讲了一个使人激动的故事。
it's nothingget) excited about. 这没什么可值得激动的。
i've got an exciting piece of work. 我得到了一份令人兴奋的工作。
基本句型： 物+ 动词 + 人 = 物 + be v.-ing to + 人如：
the book interests me.=the book is interesting to me.
人+ be v.-ed + 介 + 物 i am interested in the book.
8. yeah. i think we should be allowed to do that. i’ll bring my camera anyway.
解析】bring、take、carry、get、lift 的用法。
动词bring,take,carry,get,lift都有“携带、运送“之意，但它们用法各异。
1）、bring意为“拿来”、“带来”是指某物或某人从别处带到说话者所在的地方来，动作由远及近。
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