These plastic flowers look so that many people think they are real.A. beautifulB. natural

问题补充：

These plastic flowers look so that many people think they are real.

A. beautiful

B. natural

C. artificial

D. similar

答案：

A. beautiful

(答案→)B. natural

C. artificial

D. similar

解析：natural自然的，与后半句“许多人认为它们是真的”相呼应。