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【简答题】
高温加热某黑色固体粉末，生成一种常见气体和一种固体单质M． （1）若M为黑色，则原固体粉末是（写化学式）______． （2）若M为亮红色，则原固体粉末是（写化学式）______．
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【单选题】He has ____ to China for the summer.
A.
come out
B.
come up
C.
come over
D.
come across
【单选题】Professor Green, known to the world as a scientist, is not only absent-minded but short-sighted as well. His mind is always busy 41 scientific problems and seldom notices what is going on 42 him. On...
A.
with
B.
around
C.
for
D.
at
【单选题】Professor Green, known to the world as a scientist, is not only absent-minded but short-sighted as well. His mind is always busy 41 scientific problems and seldom notices what is going on 42 him. On...
A.
for
B.
to
C.
towards
D.
over
【简答题】听对话，选答案。 ( )1. A. To play volleyball. ( )2. A. Red. ( )3. A. $35. ( )4. A. ( )5. A. He has a headache. B. To play chess. B. Green. B. $45. B. B. He has sore eyes. C. To play tennis...
【单选题】Professor Green, known to the world as a scientist, is not only absent-minded but short-sighted as well. His mind is always busy 41 scientific problems and seldom notices what is going on 42 him. On...
A.
to think
B.
thinking
C.
thinking about
D.
to think of
【单选题】A 66-year-old man has had cough and worsening shortness of breath for 3 years On examination, there is dullness to percussion at both lung bases and poorly audible breath sounds. On physical examinati...
A.
Atrial myxoma
B.
Essential hypertension
C.
Hyperlipidemia
D.
Rheumatic fever
E.
Smoking
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