It will be many years ______ the doctors_爱下问搜题

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问题选择题

It will be many years ______ the doctors and medical scientists can find _____ for cancer.

A．since; cures

B．when; treatments

C．before; cures

D．until; treaments

答案

答案：C

第一空考查连词，since 自从，when 当什么的时候，before 在什么之前，才，就，until直到，第二空考查短语：cures for cancer癌症的治疗方法，句意：许多年医生们和医疗科学家才找到了癌症的治疗方法。所以选C。

完形填空

阅读下面短文，从短文后各题所给的四个选项（A，B，C，D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
For centuries, magicians have used various ways to shock the audience. We all have seen how a   36  performer carefully steps   37  a bed of burning coals -- barefoot. Then he walks across   38  a single burn on his feet. Is it mind over matter, or is it just physics? As it turns   __39 , walking on burning coals isn’t that hot as   40 . “The coals are hot enough to   41__ you, but if you walk quickly across them you   42  being burned.” says Jonathan Hall, a physician at Penn State University in Eric Pennsylvania.
That’s because some coals are made   43   burning wood chips. Wood has two   44__   properties（特性）for fire-walking, explains Hall. First, wood is an insulator（绝缘体）--it doesn’t   __45  heat very well. “It   46 _ time for heat to travel   47  the wood to your feet.” Hall says. If the performer walked across red-hot metal   48 , that would truly be   49 , because metal conducts, or transmits, heat very well. The metal would   50  burn a performer’s feet.
Second, wood has a low specific heat-- it doesn’t take much heat to   51  its temperature. Heat is a form of   52 . Temperature is a   53  of heat, in units of degrees. So   54  the coals are hot, the value（数值）of heat energy they contain is low. Thus, a well-trained performer can   55  such an amazing result.
Still, you don’t want to walk on burning coals, do you?

B．communicate

D．fashionable

D．even though

问答题简答题

锚杆按锚固形式可分为哪几种？