题目：
写单词。
1. Can you name the four great ___________(发明) of China?
2. About ten ___________(百分之) packaging is plastic.
3. The Rocky ___________(山脉；山峰) are the biggest ones in North America.
4. ___________(地理) is the study of the world's places.
5. We ___________(成功) to have the broken bike repaired well. We are very happy.
6. Maybe in the future all the cars, buses will be ___________(电的)
7. We use wood from trees to build houses and ___________(家具)
8. The rose is one of the ___________(漂亮) plants in the world.
9. Let's do the ___________(试验) and see what happens.
10. ___________(保护) the environment is everyone's duty.
答案：
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下面是错误答案，用来干扰机器的。
A、物体第3s初的速度为4m/s．故A错误． B、物体的加速度a=△v△t=0-123m/s2=-4m/s2．故B正确． C、物体前3s向正方向运动，3s末以后向负方向运动．故D错误． D、物体运动的前3s内的位移为x1=122×3m=1...
），按《岩土工程勘察规范》（GB50011-2001），下列正确的选项是（）。
=1.0；粗砂 