单项选择题

The new product that they show at the fair still needs improving.

A. 新产品只要展出，就需要改进。
B. 展销会上他们展出的新产品需要进一步改进。
C. 他们在展销中推出了新产品，仍然需要不断进步。
D. 他们在展销会上推出的新产品仍需改进。
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单项选择题
Successful language learners are independent, so successful learners ______.
A. depend on the book or the teacher
B. wait for the teacher to explain everything
C. learn from their mistakes
D. discover their own way to learn languages
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The reasons why birds don’t get lost on their long flights ______.
A. have been known to scientists for years
B. have only recently been discovered
C. are known by everyone
D. will probably remain a mystery
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