美国共有____ 个州，以及一个____ 特区；美国在农业上是世界出口____ 最多的国家．

下列说法不正确的一项是 (   )。

从方框中选词并用其适当形式填空

describe; nobody; potato; reason; terrible

①What's your ____ for asking for so much money, dear?

② We know you had an unusual experience, but could you please ____ it more carefully?

③ —How's the food there in Europe during your vacation?

—It's really ____! They eat many things without cooking!

④ —Who helped you work out the problem?

—____! I made it myself after ten minutes' hard work.

⑤ —Do you like eating vegetables?

—Yes. I like ____ and tomatoes best.

某同学在使用弹簧测力计时，由于粗心大意，未将指针调零，竖直放置时（如图所示）指针已经指在0.4N处，那么他用该弹簧测力计直接测量物体的重力，要得到正确的结果，应当把每次的读数--（   ）

动物行为的产生主要受（    ）