Weather _______, we ’ll go out for a walk.
B
本题中没有连词，它不是复合句，也不是并列句。句中使用了逗号，且we小写，可知其不是两个简单句。能够这样使用的只有独立主格或with的复合结构。据此判断，本句中使用的是独立结构，其结构为：名词+分词。由于permit在这里翻译为“天气允许”，表主动，应用现在分词，故选B。
Lyingundertheskull,thehumanbraincontainsanaverageoftenbillionnervecellscalled______.
Johnson was ________ unknown before running for the presidency.
Accordingtothe"principles-and-parameters"theory,"principles"refertohighlyabstractpropertiesofgrammarwhichareappliedtolanguageingeneralandwhichgeneratephrasesandatthesametimerestrainthepowerofMovea,while"parameters"allowgeneralprinciplestooperateincertainrestrictedways,accordingtowhichparticulargrammarsofnaturallanguagesvary.
These two alarm clocks are normally set together, but now they have been reset a few hours _________.