Those countries were once worried that they would not have adequate supplies of petroleum.

A．effective

B．efficient

C．potential

D．sufficient

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参考答案

本题是对形容词的考查。题干：那些国家曾经担心自己没有足够的原油供应。题干划线词adequate意为“足够的”，effective意为“有效的”， efficient意为“有效率的”，potential意为“潜在的”，sufficient意为“足够的，充足的”，所以正确答案为D。

1 He has a very good personality and makes a lot of friends.

A．capacity

B．character

C．reality

D．attitude

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2 The construction of the railway is said to have been terminated.

A．resumed

B．put an end to

C．suspended

D．scheduled

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3 The new style of shoes appeals to those students.

A．arises

B．absorbs

C．attracts

D．accepts

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