六、 克漏字 (8%，每題 2 分) Dear Patty, Earth is a wonderful place to live,   36   we make too much air pollution! That’s why we can’t always see the stars clearlyin the sky. Sometimes, when we walk outside, we see gray fog. You know what? That’s not fog. That’s PM2.5!We can do   37   great to make the air cleaner. First, we can take a bus instead of driving a car. Second, we can help plantmore trees for our planet. Last, we can use or   38   more local food or things.I hope we can face this   39   together. Clean air is important. Best, Robert  clearly 清楚地 cleaner 更乾淨的 fog 霧 instead of 替代
【題組】36.
(A) but
(B) and
(C) because
(D) so