单选题 At the end of the Cretaceous (白垩纪), a huge meteorite (陨石) ______ into the Earth, which was linked with the mass extinction.

单选题 The device newly invented by the college student can be used to draw gas along the ______.

单选题 The researcher presented compelling evidence to ______ the team to change their approach.

单选题 On the plus side, the new touchscreen developed by the company is ______ to the slightest touch.

单选题 The accident has made the public highly ______ to the issue of safety in laboratory experiments.

单选题 Along the way, people may lose their jobs as machines replace, at least ______, human workers.

单选题 It is estimated that millions of adults around the world are ______, that is, they are unable to read or write.

单选题 Intelligent people can often ______ the complex, while the less intelligent ones are more likely to complicate the simple.