Dozens of scientific groups all over the world have been______

单选题 Dozens of scientific groups all over the world have been_______ the goal of a practical and economic way to use sunlight to split water molecules．

A．pursuing
B．chasing
C．reaching
D．winning

参考答案A

解析: A。全世界许多科研小组一直在研究一种实用、经济的方法来利用阳光一解水分子。
考查动词辨析。pursue意为“追赶；继续；从事”；chase意为“追赶，追逐”reach,意为“达到，延伸”；win意为“获胜，赢得”。pursue the goal of．．．意为“追求……的目标”，故答案为。

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单选题 She gave _______ directions about the way the rug shE aid be cleaned．

A．explicit
B．brisk
C．transient
D．opaque

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单选题 It is up to the Government to tackle the air pollution problem and ___________ measures in line with the council's suggestions．

A．set about
B．work out
C．fill up
D．bring over

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单选题He always did well at school __ having to do part-time jobs every now and then．

A．in spite of
B．regardless of
C．on account of
D．in case of

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