解析：选C。考查分隔定语从句的关系词的选择。做好本题的关键是要能辨认出该定语从句的先行词the hours和关系词被介词短语back to me所分隔。定语从句的先行词是表时间的名词hours，并且关系词在从句中用作状语，故应选择表示时间的关系副词when。
18．Our English teacher often creates an environment ________we are given the opportunity to practice spoken English.
A．when C．where
B．which D．that
解析：选C。句意：我们的英语老师常常给我们创造一种环境，在这种环境下，我们可以有机会练习英语口语。根据语境与句子结构可知答案为C项。
19．I will forever remember a certain occasion________we were in trouble and at that moment our best friend gave us a hand.
A．where C．why
B．which D．when
解析：选D。考查定语从句。先行词是occasion，根据后面的时间状语at that moment可知 occasion指时间，从句中缺少的是状语，故要使用关系副词when，相当于at which time。句意：我会永远记住当我们有麻烦时，我们最好的朋友帮助了我们。
20．My teachers always tell me that I have reached a point in my life________I am supposed to make decisions by myself.
A．where C．how
B．which D．why
21．—It seems a little ugly to me.
— ________，I think it’s rather beautiful.(2017·红桥区二模，6) A．In other words B．On the other hand C．On the contrary 答案 C
解析 句意为：——这对我来说有点难看。——恰恰相反，我觉得它相当漂亮。on the
D．In a nutshell
contrary(与此)相反，正相反，符合句意。in other words换句话说；on the other hand另一方面；in a nutshell简而言之。
22．Simply raise your hand，and a taxi appears ________ A．at no time B．at one time C．in no time D．for the time being 答案 C
解析 句意为：只要你招招手，出租车就会立即出现。in no time马上，立即，符合句意。at no time从未；at one time曾经，一度；for the time being暂时。
23．Your attitude ________ life determines how happy or unhappy you are. A．towards B．with C．on D．for 答案 A
解析 句意为：你对生活的态度决定你有多快乐或不快乐。attitude to/towards对……的态度。
24．With the development of economy，our income has increased ________ 10% in less than a year.
A．for B．by C．on D．at 答案 B
解析 句意为：随着经济的发展，我们的收入在不到一年的时间里增长了10%。by表示数量的增减程度，符合句意。for为了；on在某方面；at(用于速度、比率等)以，达。
25．The debate here will be limited in two main respects，________ the time available.
A．in view of B．in return for
C．in addition to D．in comparison with 答案 A
解析 句意为：鉴于可用的时间，这里的辩论将限定在两个主要方面。in view of鉴于，由于，符合句意。in return for作为对……的回报；in addition to除……之外(还有)；in comparison with与……相比较。
26．Hopefully，the new method will be effective，helping students to get their career plans ________.
A．at hand
B．at will
C．on trial D．on track 答案 D
27．Bless your heart，I know you didn’t break the vase ________.Don’t cry！ A．on purpose B．by accident C．on business 答案 A
解析 on purpose故意地；by accident偶然地；on business出差；by mistake弄错。由语境“我知道你不是故意的”知A项正确。
28．He is very tired，so he needs some time ________ duty for relaxation and rest. A．through
B．on
D．by mistake
C．with D．off 答案 D
解析 在英语中，on/off duty 分别译为“值日；放工”。句意为：他很累，所以他需要一些下班时间放松和休息。故选D。
29．Some traditional exercise like jogging，swimming and climbing may help people stay ________.
A．in place B．in order C．in fashion D．in shape 答案 D
解析 句意为：一些传统的运动，如慢跑、游泳和爬山或许能帮助人们保持健康。in shape处于良好状态，健康，符合句意。in place在适当的位置，准备就绪；in order井然有序；in fashion流行。
30．Many of us see reading as an investment in ourselves，so it’s only natural that we want to learn something useful ________ our efforts.
A．in view of B．in response to C．in parallel with D．in return for 答案 D
31．________ the consequences of the chemical leaks，the specialists haven’t given final conclusion before they obtain accurate statistics.
A．With regard to B．As a result of C．In spite of 答案 A
解析 句意为：关于化学泄露所产生的后果，专家在拿到准确的数据之前，还没有给出最后结论。with regard to关于；as a result of由于……的结果；in spite of尽管； in addition to除……之外。故选A。
32．I told you to keep the dog ________ the bed.I don’t want dog hair all over the bedspread.
A．over B．along C．towards 答案 D
解析 句意为：我告诉过你让狗离床远点。我不想让床单上到处都是狗毛。keep sb./sth.off sb./sth.使……不接近(或不接触、远离)某人/事物。
33．The magician picked several persons ________ from the audience and asked them to help him with the performance.
A．by accident C．at risk 答案 B
解析 句意为：魔术师从观众中随意挑选了几个人，请他们帮助他进行表演。by accident偶然；at random随便地；at risk冒险；on average平均。
34．He was born in a Chinese immigrant family who made their living ________ duck farming and fruit trading.
A．against
B．in
B．at random D．off
D．In addition to
D．on average
C．from D．for 答案 C
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