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【多选题】
下列关于雾和霾的说法中，正确的是（ ）。A.
雾是近地面层空气中水汽凝结或凝华的产物，而霾的本质是细粒子气溶胶污染；
B.
雾的颜色多呈现乳白色或者青白色，而霾则为黄色或者橙灰色；
C.
雾的多发时间为午夜到清晨，而霾则不具备明显的日变化特征；
D.
雾和霾一样，都没有明显的边界。
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【单选题】Is there an apple on the table? --- .
A.
Yes, it is.
B.
Yes, there is.
C.
No, there isn't.
D.
No, there aren't.
【多选题】下潜时,我需要平衡压力。以下哪些是平衡耳朵的正确技巧?
A.
捏着鼻子,然后试着从鼻子轻轻吹气。
B.
做吞咽的动作,左右活动下巴。
C.
捏着鼻子,然后用力地长时间从鼻子吹气。
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【简答题】阅读理解 Once an old man went to see a doctor. The doctor looked him over carefully and said, 'Medicine won't help you. You must have a good rest. Go to bed early, drink milk, walk a lot and smoke one cig...
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【单选题】Once an old man went to see a doctor. The doctor looked him over carefully and said, 'Medicine won't help you. You must have a good rest. Go to bed early, drink milk, walk a lot and smoke one cigar a ...
A.
one
B.
two
C.
three
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