在锅炉燃烧不稳时,禁止水冷壁的()、()工作
参考答案:吹灰;打焦
— What ___________ you usually ___________ on Sundays?
— I usually watch TV at home. But last Sunday I ___________ to the park with my friends.[ ]
A. did, do, goes
B. do, do, want
C. do, does, went
D. do, do, went
蚂蝗属于()。
A、环节动物
B、原腔动物
C、节肢动物
D、扁形动物