Is this ________ elephant or _______ lion?

A．a; an             B．the, the           C．an ; a             D．an; the

Is this _______ lion or _______ elephant?

A．a, an             B．an, a             C．the, an            D．a, the

 Is this _______ lion or _______ elephant?

      A. a,  an     B. an,  a    C. the, an      D. a, the

阅读理解

　　Do you know which is the strongest animal in the world? It is so strong that it can lift 50 times its own weight(重量).

　　Perhaps you may say that it's a lion, or the elephant. But can any of them lift a thing as heavy as I mentioned? No!

　　Then what animal can lift 50 times its own weight? It's the ANT.

　　Can that be true? An ant may be as small as 1/16 of an inch or as long as two inches, but it can carry up to 50 times its own weight. Then you may think that it must have a very strong backbone(脊骨). You are wrong again. The surprising thing is that an ant doesn't have any bones. Then how can it be a good weight-lifter? It has very strong teeth, with them it carries leaves, seeds, wood and even parts of larger animals, including crocodiles, lions and so on.

　　You may be surprised to know that if a 175-pound man had the same strength (力气) as an ant, he would be able to lift 4, 000 kilograms with his teeth!

1．Which is the strongest animal?

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2．The size of an ant is ________.

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3．An ant has ________.

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4．How do ants carry things?

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5．The best title for this passage is ________.

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