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【单选题】
对于电压放大器来说，越小，电路带负载的能力越强。A.
输入电阻
B.
输出电阻
C.
电压放大倍数
D.
输入电压
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举一反三
【单选题】Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
A.
before
B.
as
C.
unless
D.
in case
【单选题】从选项中选出正确的句子翻译 Unluckily, rainforests all over the world are being cut for wood.
A.
不幸地是，世界各地雨林早已被砍伐用作木材
B.
不幸地是，世界各地雨林常常被砍伐用作木材
C.
不幸地是，世界各地雨林正在被砍伐用作木材。
【简答题】More and more trees are being cut down, and it’s time for us to stop this crime ____nature.
【单选题】Trees are cut down merely for fuel and wildlife is killed simply for food. It is time to ____ a
A.
111. Trees are cut down merely for fuel and wildlife is killed simply for food. It is time to ____ an end to waste. A．call off
B.
call for
C.
call in
D.
call on
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