单项选择题

There are many different plastics materials with many different properties, but they all have certain features in common.（）

A. 虽然有许多具有不同性质的塑料材料，但是他们都具有某些共同的特征。
B. 有许多不同品种的塑料材料，但是他们的形状是一致的。
C. 虽然有很多具有不同特征的塑料材料，但它们都有某一个相同点。
D. 有很多不同的塑料材料，它们在很多方面都不同，但在某一方面是相同的。

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热门试题

单项选择题

What do we learn from this conversation（）

A. Mike bought a new ear.
B. Tom’s going to buy a second-hand car.
C. Mike got a bargain.
D. Jack bought a new car.

单项选择题

According to the passage（）

A. front seat passenger should be over 14 years old
B. drivers must make sure that front seat passengers wear their belts
C. both the driver and the front seat passenger must wear a seat belt
D. a driver needn’t know whether the front seat passenger is over 14 or not