“充气使气球变大，却不改变气球的形状”，这比喻是（）。 A.图式 B.同化 C.顺应

In the evening, he ______ in his books.[ ]

A. reads him  

B. reads himself

C. buries him

D. buries himself

函数y=sinx在区间[0，π]上满足罗尔定理的ξ等于( )．

A．0

B．

C．

D．π

若用药物抑制癌细胞，关键是抑制下列哪种物质的形成（）

A.染色体

B.糖蛋白

C.运载体

D.溶酶体

As a result of their frequent litters, rabbits have the reputation of being ______.

A. ruthless
B. prolific
C. practical
D. rational

针阀偶件过度磨损的部位发生在（）上。Ⅰ.端面配合面；Ⅱ.喷孔；Ⅲ.圆柱配合面；Ⅳ.锥面配合面；Ⅴ.针阀体锥面。

A．Ⅱ＋Ⅲ＋Ⅳ

B．Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

C．Ⅰ＋Ⅳ＋Ⅴ

D．Ⅰ＋Ⅲ＋Ⅴ