Scientists study ____ human brains work to make computers.
| A．when | B．how | C．that | D．whether |
The doctor was busy writing an essay in ________ with his recent research.
| A．touch | B．connection |
| C．devotion | D．comparison |
A thousand words will not leave so deep an ________ as one deed.
| A．effort | B．idea | C．opinion | D．impression |
—Mr. Black, I think you have good taste in ________ art. So would you like to take ________ look at the painting?
—Yes, I'd love to.
| A．/; a | B．a; the | C．/; the | D．an; a |
Though you've got a tight schedule these days, I should be ________ if you could spare time to attend our meeting today.
| A．concerned | B．fascinated |
| C．grateful | D．determined |
—Can you describe a distinctive characteristic of this animal?
—Its neck can be extended ________ of its body.
| A．more than twice the length |
| B．twice more than the length |
| C．more than the length twice |
| D．more twice than the length |