問題詳情

三、綜合測驗(克漏字) (每題 1 分,共 20 分)[1] So far, only a few experimental biospheres __31__ on Earth. One is in Oracle, Arizona. In 1991, four men and four women tried to live inside the biosphere without any help from the __32__ world. During the experiment, things got out of __33__. Oxygen and carbon dioxide levels fell and the crew had to get help from outside when they had a __34__ of supplies. As you can imagine, in space, people __35__ in a biosphere would not be able to do this.
31.
(A) have built
(B) are building
(C) have been built
(D) will be building

參考答案

答案:C
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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