China’s New Food Act provides for a food recall system to producers have to stop production their food isn’t up to standards.
| A．that; if | B．where; if | C．which; when | D．when; where |
A big disaster took place in ________1960s when I was in ________teens.
| A．the;the | B．the;/ | C．/;my | D．the;my |
Scientists have found no ________of life on Mars so far,though great efforts have made on the research.
| A．symbols | B．signs | C．marks | D．signals |
A lot of people were made tired of the lecture which ________as long as four hours.
| A．kept | B．went on | C．continued | D．lasted |
I have to amuse myself by looking after my 10－month baby since I have nothing important to work________these days.
| A．in | B．during | C．on | D．for |
It took the scientists seven days to________Takla Makan________“the sea of death”.
| A．climb;calling | B．through;called |
| C．across;naming | D．cross;named |