Question

【题目】语法填空

Koalas, native to the Australian wilds, initially proved difficult to keep alive in zoos, because koalas eat nothing but the leaves of the eucalyptus tree(桉树). Zoos provided them ____【1】______ an unlimited supply of eucalyptus leaves. One zoo even planted eucalyptus trees _____【2】____(make) sure that the koalas had a continual supply of fresh leaves. However, koalas kept in cages always died within a year of their ___【3】_____(arrive) at the zoo.

Eventually it was discovered that eucalyptus trees less than five years old sometimes produce a kind of acid in their leaves. Taking in small quantities of this acid ___【4】____ (be) fatal to the koalas. In their natural habitat, the koalas’ senses tell them ____【5】____ eucalyptus trees have dangerous leaves, and they simply move on to other trees until they find leaves _____【6】____ are safe to eat. But in zoos, when their keepers unknowingly were giving them leaves with acid, the koalas ____【7】____(leave) with only two options: eat the poisonous leaves ____【8】___ starve. Either option was fatal to the ____【9】_____(trap) koalas.

Fortunately, today’s zoos use special tests to distinguish between poisonous eucalyptus leaves and safe ___【10】______, and now koalas are eating well and living an easy life in zoos.

Answer 1

【答案】

【1】with

【2】to make

【3】arrival

【4】is

【5】which

【6】which/that

【7】were left

【8】or

【9】trapped

【10】ones

【解析】

【1】with 固定搭配：provide...with...“提供给某人某物”，故填with。

【2】to make 此处动词不定式表示目的，“为了确保……”，故填to make。

【3】arrival their是形容词性物主代词，修饰名词，故填arrival。

【4】is 此处是动名词短语作主语，后面的谓语动词用单数形式，故填is。

【5】which 句意：Koalas的感觉告诉我们哪一种桉树有危险的树叶。此处用which引导的宾语从句，表示“哪一种”。

【6】which/that 此处考查定语从句。leaves作先行词，指物，定语从句缺少主语，故填which/that。

【7】were left 此处表示：Koalas只被留下两个选择。根据句意可知用一般过去时态的被动语态，故填were left。

【8】or 句意：吃有毒的树叶还是饿死。表示选择，故填or。

【9】trapped 表示“被困的树袋熊”。此处是过去分词作定语，故填trapped。

【10】ones 考查代词。此处用ones代替leaves，故填ones。

【知识归纳】

1.动名词或动名词短语作主语后面的谓语动词用单数形式。Smoking harms your health.吸烟有害你的健康。比如第44小题is 此处是动名词短语作主语后面的谓语动词用单数形式，故填is。

2.一组构词 动词---名词

arrive---arrival；survive---survival；propose---proposal；try---trial.

3.provide sb. with sth./ provide sth. for sb.提供给某人某物；offer sb. sth./offer sth. to sb.提供给某人某物。