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【单选题】
Sin2cos3tan4的值( )A.
为正
B.
为0
C.
为负
D.
不能确定
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皮皮学刷刷变学霸
举一反三
【单选题】The fossil fuel would be __________ within half a century if we made no immediate actions now.
A.
exhausted
B.
extracted
C.
exhibited
D.
extinguished
【简答题】在图示电路中,有 个节点,有 支路,有 回路,有 个网孔。
【单选题】What causes the idea about the connection between fossil fuel and body weight according to the passage?
A.
Scholars worry that too much fossil fuel is consumed too fast.
B.
Obese people are not efficient while exploring the fossil fuel.
C.
A healthy world means everybody should keep fit.
D.
The climate change is becoming a major world problem.
【单选题】X、Y是元素周期表中ⅥA族的两种元素。下列叙述中能说明X的非金属性比Y强的是 [ ]
A.
X原子的电子层数比Y原子的电子层数多
B.
X的气态氢化物比Y的气态氢化物稳定
C.
Y的单质能将X从K 2 X的溶液中置换出来
D.
Y的最高价氧化物对应的水化物的酸性比X的最高价氧化物应的水化物的酸性强
【单选题】If we continue to consume our fossil fuel supply without restraint, then someday it will be______.
A.
replenished
B.
limited
C.
available
D.
exhausted
【单选题】—Where is David? —I just saw him in the _____.
A.
lunchroom
B.
lunching room
C.
room of lunch
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