题目内容
【题目】Scientists ______ thousands of chemicals before they decided on the right one in the end.
A. tried out
B. found out
C. worked out
D. turned out
【答案】A
【解析】try out尝试、试验;find out调查;work out计算、算出、锻炼;turn out证明是、原来是。
【题目】词语填空
用下列词语填空
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【1】 Before buying a car, my dad always looks at its _______.
【2】Early American settlers were great _________, they could build almost anything from wood.
【3】Both adults and children like to watch _______ just for __________.
【4】There are about 60 different kinds of _______ around the world, but only two kinds live in North America.
【5】_______ is a big business for small countries like Singapore.
【6】When I was little, my favorite thing o do was to go to the playground and slide down ________ and _______ on swings.