You can"t appreciate happiness _______ you have known sadness too. [ ]A. b

题型：河北省模拟题难度：来源：

You can"t appreciate happiness _______ you have known sadness too.   [     ]
A. because
B. when
C. though
D. unless

答案

举一反三

   __ it was hard for children to leave family and friends, many families chose to send their children
to America.    [     ]
A. Because
B. Although
C. If
D. As

题型：山东省模拟题难度：| 查看答案

Scientists estimate that plants and animals lived _____ 3.5 billion years ago. [ ]
A. as far as
B. as many as
C. as long as
D. as old as

题型：上海模拟题难度：| 查看答案

Facing a beggar, I may feel this poor person needs help, and the need will not be met _____ I put my
hand in my pocket now.[ ]
A. since
B. in case
C. unless
D. while

题型：上海模拟题难度：| 查看答案

_____ you"ve tried it, you can"t imagine how tasty the fish I cooked is.  [     ]
A. Because
B. Unless
C. Although
D. So long as

题型：上海模拟题难度：| 查看答案

It has come to be realized ______ particular matters in the air expose us to life"s real danger. [     ]
A. what
B. which
C. when
D. that

题型：上海模拟题难度：| 查看答案