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【单选题】
What is the heart of the lubrication system, which is located in the oil pan on the bottom of the engine? And it pulls oil up from the oil pan and makes the engine oil circulate through the engine.A.
Screened intake
B.
oil filter
C.
oil pump
D.
oil pressure relief valve
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【简答题】用所给词的正确形式填空。 1. What's he doing now? He ________ (drink) pop. 2. Is Kim _________ (sing)? 3. My mother like __________ (watch) TV, but she __________ (not watch) now. 4. Please be ___________ (quietly...
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【单选题】— What's she doing now? — She's _____ in the sun and _____ an apple. [ ]
A.
lying; eating
B.
lying; eat
C.
lie; eating
D.
lie; eat
【简答题】请结合上下文将下列对话补充完整。 1. — What's he doing now? — He's __________________ football. 2. — When do you go to school? — I often __________________ to school at 7: 30. 3. — What's Lily doing now? — She is ____...
【单选题】特异性IgM水平升高有助于感染早期诊断的原因是
A.
IgM比其他类型lg容易测定
B.
lgM在免疫防御中具有重要作用
C.
lgM半衰期较短,激活补体能力最强
D.
IgM是个体发育过程中最早合成的lg
E.
IgM是免疫应答中最早产生的抗体,且半衰期较短.
【单选题】—What's your mother doing now? —She ______ supper in the kitchen. [ ]
A.
cooks
B.
cooked
C.
has cooked
D.
is cooking
【简答题】Shhhhh! Be quiet! Bees (sleep) .
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