12.It is still under discussion ________ the old bus station should be replaced with a modern hotel or not.
A.whether
B.when
C.which
D.where
答案 A [考查名词性从句。此处句子中的it为形式主语,根据句意“是否”以及句式or not推知用whether引导。]
13.I greeted the teacher with “Hello”, and the teacher gave me a sweet smile ________.
A.by turns
B.in return
C.in turn
D.for turn
答案 B [考查介词短语。根据语境“向老师问好”“老师作出微笑”,推知“回报”,in return意思为“回报……”符合题意。]
14.We can never expect ________ bluer sky unless we stop ________ industrial waste going into ________ atmosphere.
A.a; the; the
B. the; the; the
C.a; /; the
D. the; /; /
答案 A [考查冠词。第一空表示泛指“一个清洁的天空”;其他两空均为特指。]
15.As a student in Senior Three, I must work hard. ________, I should take exercise to strengthen my body.
A.Otherwise
B.Meanwhile
C.Therefore
D.Thus
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