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【单选题】
It's dark (暗的) in the room. Please ______ the light. [ ]A.
turn on
B.
turn up
C.
turn down
D.
turn off
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【简答题】抗日战争时期，无产阶级及其政党在革命统一战线中必须坚持的原则是（ ）
【单选题】______ they will send us an invitation is not yet known, ______ we hope they sill.
A.
If write
B.
That so
C.
When yet
D.
Whether but
【单选题】Resistors can not be used to ( ).
A.
as voltage dividers
B.
serve as circuit loads
C.
limit current
D.
block current
【单选题】设集合A={x|-1＜x＜1}，集合B={x|0＜x＜4}，则A∩B等于（ ）
A.
{x|0＜x＜1}
B.
{x|-1＜x＜0}
C.
{x|-1＜x＜4}
D.
{x|1＜x＜4}
【简答题】设集合A＝{x|x 2 ＜4}，B＝ . (1)求集合A∩B； (2)若不等式2x 2 ＋ax＋b＜0的解集为B，求a，b的值．
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