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单项填空（共15小题；每小题1分，满分15分）
从每题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
It\'s well known that ____ year 2006 saw many developments in ____ science and technology with those in the field of space science being particularly notable.
A. the; an B. the;/ C. /;an D. the;the
Using renewable energy sources is a simple idea, but ________ we find it hard to put into practice.
从每题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
It\'s well known that ____ year 2006 saw many developments in ____ science and technology with those in the field of space science being particularly notable.
A. the; an B. the;/ C. /;an D. the;the
Using renewable energy sources is a simple idea, but ________ we find it hard to put into practice.
