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【单选题】
原核生物染色体基因组是A.
线性双链DNA分子
B.
线性单链DNA分子
C.
环状双链DNA分子
D.
环状单链DNA分子
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举一反三
【单选题】— Who’s singing in the next room? — It ______ be Mary. She ______ New York.
A.
mustn’t, is in
B.
must, has gone to
C.
could, has been in
D.
can’t, has gone to
【简答题】What is the meaning of black in the facial makeup?
【单选题】关于switch语句，下列说法中不正确的是（ ）A. default分支可以没有 B. case语句必须以break结束C. switch后的表达式可以是字符型 D. case后的常量值必须唯一
A.
A
B.
B
C.
C
D.
D
【单选题】He must be in the room, because the light in the room is__________.
A.
open
B.
on
C.
off
D.
in
【单选题】He must be in the room, because the light in the room is _____. [ ]
A.
open
B.
off
C.
on
D.
in
【单选题】The light is on in Tom's room. He ________ be at home now. [ ]
A.
could
B.
must
C.
can
D.
need
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