After the new technique was introduced，the factory produced ________ tractors in 1988 as the year before.
| A．as twice many | B．as many twice | C．twice as many | D．twice many as |
As we all know, the functions of our skin are very .
| A．complex | B．simple | C．brief | D．tight |
--- Can I come and have a look at your new house? --- Yes, !
| A．with pleasure | B．I like it | C．by all means | D．I quite agree |
It is generally accepted thatboy must learn to stand up and fight likeman.
| A．a; the | B．a; a | C．the; the | D．a; / |
The islands developed on their own for 80 million years and ________ have many rare animals found nowhere else.
| A．soon | B．so | C．early | D．yet |
She is a crazy fan of this singer. ________ she listens to his songs hundreds of times, she will never get tired.
| A．If | B．Unless ． | C．As long as ． | D．Even if |