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【单选题】
一般认为肌肉收缩是由于A.
粗肌丝缩短
B.
细肌丝卷曲
C.
粗细肌肉均缩短
D.
粗细肌丝均卷曲
E.
细肌丝在粗肌丝之间滑行
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皮皮学刷刷变学霸
举一反三
【单选题】— Look at the boy running on the ground, Is it David? — It _____ be him, he has just gone to the teacher's office. [ ]
A.
must
B.
can't
C.
could
D.
may
【单选题】--David, look at the man in the over there. Can you tell me____? - -He is a doctor.
A.
who is he
B.
who he is
C.
what does he do
D.
what he does
【简答题】v. to fail to take care of sb/sth; to not give enough attention to sth
【单选题】---David, look at the man in white over there. Can you tell me_____ ?
A.
--He is a doctor.
B.
who is he
C.
who he is
D.
what is he
E.
what he is
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