题目内容

mini-talk 2

A. Organic farming can reduce soil erosion.
B. Organic crops produce lower yields.
C. Organically grown food tastes strange.
D. Organic farming is better for the environment.

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mini-talk 2

A. It will grow 70%.
B. It tends to be relatively stable.
C. It is expected to decline.
D. It could double.

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mini-talk 2

A. Organic farming on a large scale.
B. A combination of organic and conventional methods.
Conventional farming without any use of fertilizers.
D. Genetic farming used with caution

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一质点在做圆周运动时，有（）

A. 切向加速度一定改变，法向加速度也改变。
B. 切向加速度可能不变，法向加速度一定改变。
C. 切向加速度可能不变，法向加速度不变。
D. 切向加速度一定改变，法向加速度不变。

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物体在直线上运动前进时，如果物体向前的加速度减小，物体前进的速度也就减小了。（）

A. 对
B. 错

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mini-talk 2

A. Organic farming can reduce soil erosion. B. Organic crops produce lower yields. C. Organically grown food tastes strange. D. Organic farming is better for the environment.

mini-talk 2

mini-talk 2

一质点在做圆周运动时，有（ ）

物体在直线上运动前进时，如果物体向前的加速度减小，物体前进的速度也就减小了。（）

A. Organic farming can reduce soil erosion.
B. Organic crops produce lower yields.
C. Organically grown food tastes strange.
D. Organic farming is better for the environment.

一质点在做圆周运动时，有（）