哺乳动物的运动系统由骨和肌肉组成              （    ）

“友谊的小船说翻就翻”这一网络流行语启示我们（    ）

The old couple have been married for 40 years and never once ___________ with each other．

To persuade drivers to ____checking their phones whenever they beep, the New York state plans to introduce so-called Texting Zones along its major highways to make sure of the drivers' safety.

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