— Linda, could you tell me ______? — He

It’s not good for students to play _____ computer games.

A．too much

B．much too

C．too many

D．many too

Make sentences. 单词大排队，看谁站得对！

1.

                                                                                                                                     .

2.

                                                                                                                                       .

3. 

                                                                                                                                          .

4. 

                                                                                                                                         .

5.

                                                                                                                                         .

塑性是金属材料在受外力作用时产生（）而不发生断裂破坏的能力。

A.永久变形；

B.暂时变形；

C.变形；

D.弯曲。

下列物质哪种属于优导体（）。

A.肌肉

B.结缔组织

C.神经

D.肾

E.胃液

帮助DNA解旋的（）与单链DNA结合，使碱基仍可参与模板反应。