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【单选题】
均由极性键组成的非极性分子是A.
BF 3 , CO 2 , CH 4
B.
I 2 , CH 4 , CO 2
C.
H 2 O, CH 3 Cl, O 2
D.
H 2 S, HCl, C 6 H 6
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举一反三
【单选题】He saw his friends _______ at the airport last Sunday A. through B. off C. learn D. goodbye
A.
B.
C.
D.
D
【单选题】He saw his friends_____ at the airport last Sunday.
A.
through
B.
off
C.
leave
D.
Forget.
【单选题】Yesterday she saw his brother with his friends when he walked into the park.
A.
play
B.
played
C.
playing
D.
to paly
【单选题】He saw his friends ______ at the airport last Sunday.
A.
through
B.
off
C.
leave
D.
goodbye
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