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【简答题】
The main reason for the increasing popularity of these aircrafts __________________ (不是乘飞机不昂贵，而是因为乘飞机是件有趣的事).
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举一反三
【单选题】According to the result of the tests of the body's energy needs, physiologists concluded that _______.
A.
two meals a day is best to the elderly people
B.
three-meal pattern is suitable nutritionally to the average .
C.
children need more than three meals a day
D.
having snacks is very popular in America.
【简答题】分离的,分隔的;相隔离,成距离
【简答题】(空间、时间方面)成距离,相间隔,分离的,分隔的
【单选题】About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite . They requi...
A.
The relationship between a plant's roots and its shoots.
B.
What can be learned by growing roots in isolation.
C.
How plants can be grown without roots.
D.
What elements are necessary for the growth of plants.
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