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【單選題】
關于運動物體所受的合力、合力的功、運動物體動能的變化，下列說法正確的是
A.
運動物體所受的合力不為零，合力必做功，則物體的動能一定要變化
B.
運動物體所受的合力為零，物體的動能可能改變
C.
運動物體的動能保持不變，則該物體所受合力一定為零
D.
運動物體所受合力不為零，則該物體一定做變速運動
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舉報參考答案：
舉一反三
【單選題】What is the writer’s attitude towards the generation gap?
A.
Unacceptable.
B.
Awful.
C.
Funny.
D.
Common.
【單選題】What does the speaker think all that some students care for is?
A.
friends
B.
Playing sports
C.
Having a good time.
【單選題】Why does the speaker begin to feel the pressure of work?
A.
Because she can’t borrow books which she needs from the library
B.
Because she has lots of reference books to read, and the courses are difficult
C.
Though the courses are not too hard for her, she has to read too many books
【單選題】Have a good rest, for you need to _____ your energy for the tennis match this afternoon.
A.
leave
B.
reserve
C.
hold
D.
get
相關題目：
【單選題】What is the writer’s attitude towards the generation gap?
A.
Unacceptable.
B.
Awful.
C.
Funny.
D.
Common.
【單選題】What does the speaker think all that some students care for is?
A.
friends
B.
Playing sports
C.
Having a good time.
【單選題】Why does the speaker begin to feel the pressure of work?
A.
Because she can’t borrow books which she needs from the library
B.
Because she has lots of reference books to read, and the courses are difficult
C.
Though the courses are not too hard for her, she has to read too many books
【單選題】Have a good rest, for you need to _____ your energy for the tennis match this afternoon.
A.
leave
B.
reserve
C.
hold
D.
get
參考解析：
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