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【简答题】
某直流电源在端部短路时,消耗在内阻上的功率是 400W ,则此电源能供给外电路的最大功率是 。
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【单选题】The boy is Jack Robert Smith. _____ is his family name. [ ]
A.
Jack Robert
B.
Smith
C.
Jack
D.
Robert Smith
【单选题】–– Robert: I’m going to the cinema this evening. –– Bill: ____ –– Robert: It ’s a Western “Cowboy Comes Home ”.
A.
What’s on?
B.
What’s in?
C.
What is acted?
D.
What is perform?
【单选题】________ , she is the sort of woman to spread sunshine to people through her smile.
A.
Shy and cautious
B.
Sensitive and thoughtful
C.
Honest and confident
D.
Lighthearted and optimistic
【单选题】What is the author's attitude towards 'self-esteem' (Paragraph 2) ?
A.
Unconcerned.
B.
Cautious.
C.
Supportive.
D.
Negative.
【单选题】On snowy days, you have to drive very ________ to avoid traffic accident.
A.
neatly
B.
smoothly
C.
cautiously
D.
actually
【单选题】As we know, Jean is a investor（投资者）who studies the market before he buys things.
A.
lucky
B.
cautious
C.
patient
D.
generous
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