--Will you join us to play basketball on Saturdy afternoon?
---______,but I promised to go swimming with Eric.
| A．Never mind | B．Many thanks | C．Take it easy | D．My pleasure |
Our planet is about years old.
| A．35,000 | B．4600 | C．4600 million | D．500 million |
can cause high blood pressure and hearing problems.
| A．Air pollution | B．Water pollution | C．Light pollution | D．Noise pollution |
is one of the greatest scientists, who won the Nobel Prize for physics.
| A．Yuan Longping | B．Bisheng | C．Yang Zhenning | D．Zheng He |
is the largest freshwater lake in China.
| A．Dongting Lake | B．Poyany Lake | C．Qinghai Lake | D．Hongze Lake |
is the Chinese tradional holiday.
| A．Father’s Day | B．Teachers’ Day | C．Christmas | D．the Mid-autumn |