单项选择题

It is generally accepted that old people should have a share in the rewards for material and cultural advancements to which they have made contributions（）

A．不言而喻，老年人应该享有一份回报，因为他们曾经为物质和文化做出过贡献。
B．人们普遍认为，老年人对物质和文化的进步做出过贡献，应该分享其成果。
C．毫无疑问，老年人有实力又有文化，他们都会主动为社会和文明多做贡献。
D．毋庸置疑，老年人创造过物质和精神文明，他们应该享受各种奖励。

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单项选择题

The passage implies that if the air leakage came from the valve,（）

A．there is no need to remove the inner tube
B．you could solve the problem by putting spit on it
C．you would still need to examine the inner tube
D．there would be no way to solve the problem

单项选择题

From the context, we can see that a lever is a tool which can be used to（）

A．remove the wheel from the bike
B．replace the wheel on the bike
C．push the tyre back into position
D．take out the inner tube