题目内容
mini-talk 1
A. Placing the thesis at the beginning.
B. Writing shorter sentences.
C. Stating the main idea at the end of the paper.
D. Using fewer descriptive words.
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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
A. It will grow 70%.
B. It tends to be relatively stable.
C. It is expected to decline.
D. It could double.
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
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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