Alice explains things very well, what she says can be understood very ＿＿＿.
| A．quietly | B．carefully | C．slowly | D．clearly |
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 |