Question

【题目】Experts do not recommend allowing children under eight to regularly use 3D glasses, __________ their eye muscles are still developing.

A. because B. though C. unless D. if

Answer 1

【答案】A

【解析】考查状语从句。句意：专家不建议允许8岁以下的儿童经常佩戴3D眼镜,因为他们的眼部肌肉还在发育。because引导原因状语从句。