1.The sick person has taken a ____ for the better.

　　A) coverB) recover C) changeD) turn

　　2.Unfortunately he couldn't ____ for the loss.

　　A) explainB) call C) accountD) take

　　3.Most science-fiction writers seek to persuade readers that the world they have created is ____ and is derived from scientific principles.

　　A) possibleB) impossible C) certainlyD) unlikely

　　4.A guided missile consists basically of a warhead attached to a tube like body. A rocket or a jet engine may ____ the missile.

　　A) powerB) pull C) compelD) expel

　　5.In judging his behavior, I hope that he committee will ____ his stage performance into account.

　　A) putB) let C) takeD) make

　　答案与解析：

　　1.D。

　　take a turn for the better病情有所好转。

　　2.C。

　　account for，固定搭配，意为"解释"。

　　3.A。

　　根据句义，此处需填入的词应具有肯定意义，因而possible为恰当选项;certainly为副词，不适用。

　　4.A。

　　power提供动力;pull拉;compel强迫;expel驱逐。

　　5.C。