问题:
A. casually B. especially ...
问题:
A. attended B. to attend ...
问题:
A. launched B. presented ...
问题:
A. landscapes B. cities ...
问题:
A. for example B. in addition ...
问题:
A. simple B. beneficial ...
问题:
A. Construction B. Pollution ...
问题:
A. amount B. purity ...
问题:
A. people B. species ...
问题:
A. effective B. small ...
问题:
A. How B. Whether ...
问题:
A. crowded B. extensive ...