20世纪20年代，斯大林指出：“我们的工业和我们的经济现状决定暂时不能不向农民征收这种额外税……我们的政策应当是逐渐缩小这种‘剪刀差’，使它一年一年地接近起来……从而在几年以后完全取消对农民的这种额外税。”这一表述主要意图是（    ）

    Grace is a student of a junior high school. She is a good student. She usually gets up at six in the morning. Then she has breakfast.____ Her mother takes her to school in the car. It takes about half an hour to drive there.

    The first class begins at seven thirty.____ She has lunch at school at twelve o'clock. She often has rice and vegetables for lunch because (因为) it's her favorite food.____

    In the afternoon, classes begin at half past one.____ She gets home at about a quarter to five and has dinner at six.____ At about nine thirty, she goes to bed.

根据短文内容，从下面五个选项中选出能填入空缺处的最佳选项，使短文意思通顺。

依据如图所示的几种微生物形态结构示意图，回答：

A的 $\frac{2}{3}$ 相当于B的 $\frac{3}{4}$ ，A∶B= $\frac{3}{4}$ ∶ $\frac{2}{3}$ 。