[单项选择]可能产生阴燃火或发生火灾不及时报警将造成重大损失的场所，不宜选择( )。
A. 离子感烟探测器
B. 点型感烟探测器
C. 光电感烟探测器
D. 感温探测器

If there is no difference in general intelligence between boys and girls, what can explain girls’ lack of success in science and mathematics
It seems to be that their treatment at school is a direct cause. Mathematics and science are seen as mainly male subjects, and therefore, as girls become teenagers, they are less likely to take them up. Interestingly, both boys and girls tend to regard the "male" subjects as more difficult. Yet it has been suggested that girls avoid mathematics courses, not because they are difficult, but for social reasons. Girls do not want to be in open competition with boys, nor do they want to do better than boys because they are afraid to appear less ladylike and attractive.
However, if we examine the performance of boys and girls who have undertaken mathematics courses, there are still more high-achieving boys than there are girls. This difference appears to be worldwide. Biological explanations have been offere
A. Why do teenage girls avoid mathematics courses
B. They think mathematics is not interesting.
C. They think mathematics is difficult.
D. They think mathematics is competitive.
E. They think boys will not like it either.