单项选择题

How many Chinese students are involved in the conference

A．17.
B．23.
C．11.
D．13.
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单项选择题
Which of the following is TRUE about the north polar cap of Mars in summertime
A．It is at its largest size.
B．It is changing its shape all the time.
C．It is at its smallest size.
D．It is at its windiest time.
单项选择题
What is the characteristic of the Martian surface according to observations over the past 20 years
A．Remaining stable all the time.
B．Appearing bright red.
C．Looking dark most of the time.
D．Changing from bright to dark or vice versa.
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