A:零
B:mg
C:无穷大
D:无法确定
—Peter, how old is your father this year?
—_______. And we just had a party for his _______ birthday last weekend.
分析黄果树瀑布景区每年5月到10月形成旅游旺季的原因,并说明近距离观赏瀑布需要携带的用品及理由。
—I don't like it _______ it is much faster.