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【单选题】
()颗粒在流体中做沉降运动时,阻力系数:A.
仅与颗粒雷诺数有关
B.
仅与颗粒球形系数有关
C.
与颗粒雷诺数和球形系数都有关
D.
与颗粒雷诺数和球形系数都无关
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【简答题】Listen and judge. ( )1. I went skating. ( )2. I went to school at 5:00. ( )3. Amy cleaned the room last weekend. ( )4. I have a toothache. ( )5. She has a bad cold.
【单选题】The testing company bought ____ X-ray machine ____ day before yesterday from Germany.
A.
a；the
B.
/;the
C.
an;the
D.
an;/
【单选题】I wonder _____ Mom will buy me a Christmas present this year.
A.
what
B.
which
C.
whether
D.
how
【简答题】给下列的图片选择对应的词组。 ( ) 1. A. rowed a boat ( ) 2. B. went ice-skating ( ) 3. C. went skiing ( ) 4. D. bought presents
【简答题】看图写单词。 1. b______ 2. r ______ 3. pe ______ 4. e ______ 5. ba ______
【单选题】听力原文：M: The piano sounds terrible. I wonder if the player is professional. W: I wish I could ask for my money back. This performance is not enjoyable. Where are the speakers?
A.
At a cinema.
B.
At a training center.
C.
At home.
D.
At a party.
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