说明理由 1.The number of children who contracted colds and visit

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说明理由
1.The number of children who contracted colds and visited the hospital ______ in the country since last fall.
A.increased B.would contracted C.has increased D.had increased
2.In America parents usually keep in close contact with their grown-up children,but the relation between them is usually not so close as ______ of the Chinese family.
A.that B.it C.one D.the other
3.Some living creatures can change certain features of their environment so as to suit _______.
A.that B.it C.one D.the other

1.D 句子中有since引起的时间状语,要用完成时态,选择过去完成时,是根据主从复合句时态一致的原则.
2.A that 指代the relation.
3,B.it 是代词,这里指environment.
再问：为什么第2题要用that指代the relation 第三题用it 指代environment？
再答： that代替句中名词,避免重复，所指与前述名词同类但不同一，具体指哪个取决于后面of 的短语 it 用来特指上文中提到的同名同物

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